var DomUtils = new Object;


/**
 * Browser detection function namespace
 *
 * @access public
 * @since  v1.4.8.1.2.4
 */
DomUtils.browser = new Object;

/**
 * RegEx definitions for browser detections based on property tested
 *
 * @access public
 * @since  v1.4.8.1.2.4
 */
DomUtils.browser.regexes = {
    overflowX: new Array(/Firefox\/1\.0/),
    overflowY: new Array(/Firefox\/1\.0/)
};

/**
 * Determines if the browser supports CSS overflowX property correctly
 *
 * @access public
 * @since  v1.4.8.1.2.4
 */
DomUtils.browser.supportsOverflowX = function() {
    for (var i=0; i<DomUtils.browser.regexes.overflowX.length; i++) {
        var regex = DomUtils.browser.regexes.overflowX[i];
        if (navigator.userAgent.match(regex)) {
            return false;
        }
    }
    return true;
}



/**
 * Determines if the browser supports CSS overflowY property correctly
 *
 * @access public
 * @since  v1.4.8.1.2.4
 */
DomUtils.browser.supportsOverflowY = function() {
    for (var i=0; i<DomUtils.browser.regexes.overflowY.length; i++) {
        var regex = DomUtils.browser.regexes.overflowY[i];
        if (navigator.userAgent.match(regex)) {
            return false;
        }
    }
    return true;
}

/**
 * Determines if the browser supports the Document Object Model
 *
 * @access public
 * @since  v1.4.8.1.2.4
 */
DomUtils.browser.supportsDom = function() {
    return (document.getElementById) ? true : false;
}

/**
 * Determines if the browser is Internet Explorer
 *
 * @access public
 * @since  v1.4.8.1.2.4
 */
DomUtils.browser.isIE = function() {
    return (document.all && navigator.appName.indexOf('Microsoft Internet Explorer') > -1) ? true : false;
}

/**
 * Determines if the browser is Internet Explorer 6
 *
 * @access public
 * @since  v1.4.8.1.2.4
 */
DomUtils.browser.isIE6 = function(){
    temp=navigator.appVersion.split('MSIE');
    ieVer=parseInt(temp[1]);
    return (ieVer == 6)?1:0;    
}

/**
 * Determines if the browser is Safari
 *
 * @access public
 * @since  v1.4.8.1.2.4
 */
DomUtils.browser.isSafari = function() {
    return (navigator.userAgent.toLowerCase().indexOf('safari') > -1) ? true : false;
}







/**
 * Fixes pseudo-leaks in Internet Explorer.
 *
 * Use this method anytime you need to remove an element
 * since it will do it in a memory clean manner for both
 * Internet Explorer and Firefox.
 *
 * @access public
 * @since  v1.4.8.1.2
 * @param  DomNode   elem
 * @return void
 */
DomUtils.removeElement = function(elem) {
    if (DomUtils.browser.isIE()) {
        var garbageBin = document.getElementById('IELeakGarbageBin');
        if (!garbageBin) {
            garbageBin = document.createElement('DIV');
            garbageBin.id = 'IELeakGarbageBin';
            garbageBin.style.display = 'none';
            document.body.appendChild(garbageBin);
        }
        // move the element to the garbage bin
        garbageBin.appendChild(elem);
        garbageBin.innerHTML = '';
    } else {
        elem.parentNode.removeChild(elem);
    }
}




/**
 * Returns the window width in pixels (integer form)
 *
 * @access public
 * @since  v1.1
 * @param  Window    win    Window object (optional)
 * @return integer
 */
DomUtils.getWindowWidth   = function(win) {
    
    win = (win) ? win : window;
    if (document.compatMode == 'CSS1Compat') 
    {
        
        if(parseInt(win.document.body.parentNode.clientWidth) == 0)
        return  win.document.body.clientWidth
        else
    return parseInt(win.document.body.parentNode.clientWidth);
    } 
    else if (DomUtils.browser.isIE())
    {        
        
        return parseInt(win.document.body.clientWidth);
    }
    else                                     return parseInt(win.innerWidth);
    
}


/**
 * Returns the window height in pixels (integer form)
 *
 * @access public
 * @since  v1.1
 * @param  Window    win    Window object (optional)
 * @return integer
 */
DomUtils.getWindowHeight  = function(win) {
    
    win = (win) ? win : window;
    if (document.compatMode == 'CSS1Compat')
    {

     return parseInt(win.document.body.parentNode.clientHeight);
    }
    else if (DomUtils.browser.isIE())        return parseInt(win.document.body.clientHeight);
    else                                     return parseInt(win.innerHeight);
}


/**
 * Returns the window's scrolled position on the x-axis in pixels (integer form)
 *
 * @access public
 * @since  v1.1
 * @param  Window    win    Window object (optional)
 * @return integer
 */
DomUtils.getWindowScrollX = function(win) {
    win = (win) ? win : window;
    if (document.compatMode == 'CSS1Compat' && win.document.body.parentNode.scrollLeft) return parseInt(win.document.body.parentNode.scrollLeft);
    else if (DomUtils.browser.isIE())                      return parseInt(win.document.body.scrollLeft);
    else if (typeof( window.pageXOffset ) == 'number' || window.pageXOffset === 0 )   return parseInt(window.pageXOffset);
    else                                                  return parseInt(win.scrollX);
}


/**
 * Returns the window's scrolled position on the y-axis in pixels (integer form)
 *
 * @access public
 * @since  v1.1
 * @param  Window    win    Window object (optional)
 * @return integer
 */
DomUtils.getWindowScrollY = function(win) {
    win = (win) ? win : window;
    if (document.compatMode == 'CSS1Compat' && win.document.body.parentNode.scrollTop) return parseInt(win.document.body.parentNode.scrollTop);
    else if (DomUtils.browser.isIE())                   return parseInt(win.document.body.scrollTop);
    else if (typeof( window.pageYOffset ) == 'number' ) return parseInt(window.pageYOffset);
    else                                                return parseInt(win.scrollY);
}


///**
// * Returns the element's width after css clipping
// *
// * @access public
// * @since  v1.1
// * @deprecated       Unnecessary -- I think. Keep the code just in case
// * @param  Element   elem  Element to get the clip width
// * @return integer
// */
//DomUtils.getElementClipWidth = function(elem) {
//    var currStyle = DomUtils.getCurrentStyle(elem);
//    var pre = document.createElement('pre');
//    var str = "current style props:\n";
//    for (var prop in currStyle) {
//        str += prop+": "+currStyle[prop]+"\n";
//    }
//    pre.appendChild(document.createTextNode(str));
//    document.body.appendChild(pre);
//}


/**
 * Returns the element width in pixels (integer form)
 *
 * @access public
 * @since  v1.1
 * @param  Element    elem    Element object
 * @return integer
 */
DomUtils.getElementWidth  = function(elem) {
    
    var eStyle, prop, width;
    var w = 0;
    if (elem.tagName == 'IMG')                    w = parseInt(elem.width);
    else if (document.compatMode == 'CSS1Compat') w = parseInt(elem.offsetWidth);
    else if (document.compatMode == 'BackCompat') {
        eStyle = DomUtils.getCurrentStyle(elem);
        
        width  = parseInt(eStyle.width);
        if (DomUtils.browser.isIE()) width = elem.offsetWidth;
        var bLeft  = parseInt(eStyle.borderLeft);
        var bRight = parseInt(eStyle.borderRight);
        var pLeft  = parseInt(eStyle.paddingLeft);
        var pRight = parseInt(eStyle.paddingRight);
        w  = parseInt(width);
        w += !isNaN(bLeft)  ? parseInt(bLeft)  : 0;
        w += !isNaN(bRight) ? parseInt(bRight) : 0;
        w += !isNaN(pLeft)  ? parseInt(pLeft)  : 0;
        w += !isNaN(pRight) ? parseInt(pRight) : 0;
    } else if (DomUtils.browser.isSafari()) {
        if (typeof(writeDebug) == 'function') writeDebug('browser is safari...');
        width = elem.offsetWidth;
        w = parseInt(width);
    }
    return w;
}


/**
 * Returns the element height in pixels (integer form)
 *
 * @access public
 * @since  v1.1
 * @param  Element    elem    Element object
 * @return integer
 */
DomUtils.getElementHeight = function(elem) {
    var h = 0;
    var eStyle, height;
    if (elem.tagName && elem.tagName == 'IMG')    h = parseInt(elem.height);
    else if (document.compatMode == 'CSS1Compat') h = parseInt(elem.offsetHeight);
    else if (document.compatMode == 'BackCompat') {
        eStyle  = DomUtils.getCurrentStyle(elem);
        height  = parseInt(eStyle.height);
        if (DomUtils.browser.isIE()) height = elem.offsetHeight;
        var bTop    = parseInt(eStyle.borderTop);
        var bBottom = parseInt(eStyle.borderBottom);
        var pTop    = parseInt(eStyle.paddingTop);
        var pBottom = parseInt(eStyle.paddingBottom);
        h  = parseInt(height);
        if (!DomUtils.browser.isIE()) {
            h += !isNaN(bTop)    ? parseInt(bTop)    : 0;
            h += !isNaN(bBottom) ? parseInt(bBottom) : 0;
            h += !isNaN(pTop)    ? parseInt(pTop)    : 0;
            h += !isNaN(pBottom) ? parseInt(pBottom) : 0;
        } else {
            h -= !isNaN(bTop) ? parseInt(bTop) : 0;
            h -= !isNaN(bBottom) ? parseInt(bBottom) : 0;
        }
    } else if (DomUtils.browser.isSafari()) {
        height = elem.offsetHeight;
        h = parseInt(height);
    }
    return h;
}


/**
 * Returns the element's left position in pixels (integer form)
 *
 * @todo   add error handling code -- find out what falls into catch code block
 * @access public
 * @since  v1.1
 * @param  Element    elem    Element object
 * @return integer
 */
DomUtils.getElementLeft   = function DomUtils_GetElementLeft(elem) {
    var left = 0;
    try {
        if (elem.offsetParent) {
            while (elem.offsetParent) {
                left += parseInt(elem.offsetLeft);
                elem  = elem.offsetParent;
            }
        } else if (elem.x) {
            left += parseInt(elem.x);
        }
        return left;
    } catch (e) {
        /**
         */
        return 0;
    }
}


/**
 * Returns the element's top position in pixels (integer form)
 *
 * @todo   add error handling code -- find out what falls into catch code block
 * @access public
 * @since  v1.1
 * @param  Element    elem    Element object
 * @return integer
 */
DomUtils.getElementTop    = function(elem) {
    try {
        var top = 0;
        if (elem.offsetParent) {
            while (elem.offsetParent) {
                top += parseInt(elem.offsetTop);
                elem = elem.offsetParent;
            }
        } else if (elem.y) {
            top += parseInt(elem.y);
        }
        return top;
    } catch (e) {
        return 0;
    }
}







/**
 * Centers an element inside its window.
 *
 * @access public
 * @since  v1.1
 * @param  Element    elem    Element object
 * @return void
 */
DomUtils.center = function(elem) {
    var wWidth  = parseInt(DomUtils.getWindowWidth());
    var wHeight = parseInt(DomUtils.getWindowHeight());
    var eWidth  = parseInt(DomUtils.getElementWidth(elem));
    var eHeight = parseInt(DomUtils.getElementHeight(elem));
    var xScroll = parseInt(DomUtils.getWindowScrollX());
    var yScroll = parseInt(DomUtils.getWindowScrollY());
    
    var left = parseInt(wWidth / 2) - parseInt(eWidth / 2) + xScroll;
    var top  = parseInt(wHeight / 2) - parseInt(eHeight / 2) + yScroll;
    elem.style.left = left+'px';
    elem.style.top  = top+'px';
}







/**
 * Returns the element's current style object
 *
 * @access public
 * @since  v1.1
 * @param  Element   elem   Element object
 * @return Style
 */
DomUtils.getCurrentStyle  = function(elem) {
    if (elem && elem.currentStyle) {
        return elem.currentStyle;
    } else if (document.defaultView && document.defaultView.getComputedStyle) {
        return document.defaultView.getComputedStyle(elem, '');
    }
}

/**
 * Copies the current style applied on element 1 to element 2.
 * 
 * @access public
 * @since  v1.8
 * @param  Element    elem1
 * @param  Element    elem2
 * @return void
 */
DomUtils.duplicateStyle = function(elem1, elem2) {
    var style1 = DomUtils.getCurrentStyle(elem1);
    //var str = 'style1: '+style1+"<br/>\n";
    for (prop in style1) {
        try {
            //elem2.style[prop] = style1[prop];
            eval('elem2.style.'+prop+' = style1.'+prop);
            //var span = document.createElement('span');
            //span.innerHTML = 'set style1.'+prop+': '+style1[prop]+"<br/>\n";
            //document.getElementsByTagName('body')[0].appendChild(span);
        } catch(e) {
            //var span = document.createElement('span');
            //span.innerHTML = 'failed setting style1.'+prop+': '+style1[prop]+"<br/>\n";
            //document.getElementsByTagName('body')[0].appendChild(span);
        }
    }
};


/**
 * Returns the element's zIndex attribute (integer form)
 *
 * @access public
 * @since  v1.1
 * @param  Element   elem   Element object
 * @return integer
 */
DomUtils.getZIndex = function(elem) {
    var eStyle = DomUtils.getCurrentStyle(elem);
    var zIdx   = 0;
    if (eStyle.zIndex && isNaN(eStyle.zIndex)) {
        if (elem.offsetParent) {
            while (elem.offsetParent) {
                zIdx   = (parseInt(eStyle.zIndex) > zIdx) ? parseInt(eStyle.zIndex) : zIdx;
                eStyle = DomUtils.getCurrentStyle(elem);
                elem   = elem.offsetParent;
            }
        }
    } else {
        zIdx = parseInt(eStyle.zIndex);
    }
    return zIdx;
}




///**
// * alerts an image's ready state if not complete
// *
// * @access public
// * @deprecated       I highly doubt this is used anywhere?
// * @since  v1.1
// * @param  Window    win    Window object (optional)
// * @return integer
// */
//DomUtils.checkImage = function() {
//    if (this.readyState != 'complete') {
//        alert(this.src+"\n"+this.readyState);
//    }
//}




/**
 * Returns a reference to the document's body tag
 *
 * @access public
 * @since  v1.1
 * @return Element
 */
DomUtils.getBody = function() {
    return document.getElementsByTagName('body')[0];
}





/**
 * Returns the window height in pixels (integer form)
 *
 * This should probably be deprecated / removed in favor
 * of net.RequestQueue
 *
 * @access public
 * @deprecated       Use net.RequestQueue instead
 * @since  v1.1
 * @return integer
 */
DomUtils.XmlHttp = function() {
    var request = null;
    try {
        ActiveXObject.prototype.jsonRequest = null;
        request = new ActiveXObject('Msxml2.XMLHTTP');
    } catch (e) {
        try {
            ActiveXObject.prototype.jsonRequest = null;
            request = new ActiveXObject('Microsoft.XMLHTTP');
        } catch (e) {
            try {
                XMLHttpRequest.prototype.jsonRequest = null;
                request = new XMLHttpRequest();
            } catch (e) {
                //request = new IframeHttpRequest();
                request = null;
            }
        }
    }
    return request;
}




















/**
 * Adds method function to Function objects
 *
 * @access public
 * @since  v1.1
 * @param  string    name   Name of the method to create
 * @param  Function  func   Function reference to assign to the method
 * @return Function
 */
Function.prototype.method = function(name, func) {
    this.prototype[name] = func;
    return this;
}

/**
 * Returns true if param is not a javascript object
 *
 * @access public
 * @since  v1.1
 * @param  mixed     a      test this param
 * @return boolean
 */
function isAlien(a) {
   return isObject(a) && typeof a.constructor != 'function';
}

/**
 * Returns true if the param is an array
 *
 * @access public
 * @since  v1.1
 * @param  mixed     a      test this param
 * @return boolean
 */
function isArray(a) {
    return isObject(a) && a.constructor == Array;
}

/**
 * Returns true if the param is a boolean data type
 *
 * @access public
 * @since  v1.1
 * @param  mixed     a      test this param
 * @return boolean 
 */
function isBoolean(a) {
    return typeof a == 'boolean';
}

/**
 * Returns true if the param is empty (contains no value)
 *
 * @access public
 * @since  v1.1
 * @param  mixed     o      test this param
 * @return boolean
 */
function isEmpty(o) {
    var i, v;
    if (isObject(o)) {
        for (i in o) {
            v = o[i];
            if (isUndefined(v) && isFunction(v)) {
                return false;
            }
        }
    }
    return true;
}

/**
 * Returns true if the param is a float
 *
 * @access public
 * @since  v1.1
 * @param  mixed     a      test this param
 * @return boolean
 */
function isFloat(a) {
    return typeof a == 'number' && parseFloat(a) == a;
}

/**
 * Returns true if the param is a function
 *
 * @access public
 * @since  v1.1
 * @param  mixed     a      test this param
 * @return boolean
 */
function isFunction(a) {
    return typeof a == 'function';
}

/**
 * Returns true if the param is an integer
 *
 * @access public
 * @since  v1.1
 * @param  mixed     a      test this param
 * @return boolean
 */
function isInteger(a) {
    return typeof a == 'number' && parseInt(a) == a;
}

/**
 * Returns true if the param is null
 *
 * @access public
 * @since  v1.1
 * @param  mixed     a      test this param
 * @return boolean
 */
function isNull(a) {
    return typeof a == 'object' && !a;
}

/**
 * Returns true if the param is a number
 *
 * @access public
 * @since  v1.1
 * @param  mixed     a      test this param
 * @return boolean
 */
function isNumber(a) {
    return typeof a == 'number' && isFinite(a);
}

/**
 * Returns true if the param is an object
 *
 * @access public
 * @since  v1.1
 * @param  mixed     a      test this param
 * @return boolean
 */
function isObject(a) {
    return (a && typeof a == 'object') || isFunction(a);
}

/**
 * Returns true if the param is a string
 *
 * @access public
 * @since  v1.1
 * @param  mixed     a      test this param
 * @return boolean
 */
function isString(a) {
    return typeof a == 'string';
}

/**
 * Returns true if the param is undefined
 *
 * @access public
 * @since  v1.1
 * @param  mixed     a      test this param
 * @return boolean
 */
function isUndefined(a) {
    return typeof a == 'undefined';
}

/**
 * Fix PNG images for IE
 *
 * @access public
 * @since  v1.1
 * @param  mixed     a      test this param
 * @return boolean
 */
function fixPNG_IE (image) {
    //Only fix PNGs for IE
    if(DomUtils.browser.isIE()) { 
        image.outerHTML = '<div style="width:' + image.width + '; height:' + image.height + '; filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src=\'' + image.src + '\', sizingMethod=\'scale\');"></div>';
    }
}



































/** BEGIN getElementsBySelector CODE ******************************************/

/* document.getElementsBySelector(selector)
   - returns an array of element objects from the current document
     matching the CSS selector. Selectors can contain element names, 
     class names and ids and can be nested. For example:
     
       elements = document.getElementsBySelect('div#main p a.external')
     
     Will return an array of all 'a' elements with 'external' in their 
     class attribute that are contained inside 'p' elements that are 
     contained inside the 'div' element which has id="main"

   New in version 0.4: Support for CSS2 and CSS3 attribute selectors:
   See http://www.w3.org/TR/css3-selectors/#attribute-selectors

   Version 0.4 - Simon Willison, March 25th 2003
   -- Works in Phoenix 0.5, Mozilla 1.3, Opera 7, Internet Explorer 6, Internet Explorer 5 on Windows
   -- Opera 7 fails 
*/

function getAllChildren(e) {
  // Returns all children of element. Workaround required for IE5/Windows. Ugh.
  return e.all ? e.all : e.getElementsByTagName('*');
}

document.getElementsBySelector = function(selector) {
  // Attempt to fail gracefully in lesser browsers
  if (!document.getElementsByTagName) {
    return new Array();
  }
  // Split selector in to tokens
  var tokens = selector.split(' ');
  var currentContext = new Array(document);
  for (var i = 0; i < tokens.length; i++) {
    token = tokens[i].replace(/^\s+/,'').replace(/\s+$/,'');;
    if (token.indexOf('#') > -1) {
      // Token is an ID selector
      var bits = token.split('#');
      var tagName = bits[0];
      var id = bits[1];
      var element = document.getElementById(id);
      if (tagName && element.nodeName.toLowerCase() != tagName) {
        // tag with that ID not found, return false
        return new Array();
      }
      // Set currentContext to contain just this element
      currentContext = new Array(element);
      continue; // Skip to next token
    }
    if (token.indexOf('.') > -1) {
      // Token contains a class selector
      var bits = token.split('.');
      var tagName = bits[0];
      var className = bits[1];
      if (!tagName) {
        tagName = '*';
      }
      // Get elements matching tag, filter them for class selector
      var found = new Array;
      var foundCount = 0;
      for (var h = 0; h < currentContext.length; h++) {
        var elements;
        if (tagName == '*') {
            elements = getAllChildren(currentContext[h]);
        } else {
            elements = currentContext[h].getElementsByTagName(tagName);
        }
        for (var j = 0; j < elements.length; j++) {
          found[foundCount++] = elements[j];
        }
      }
      currentContext = new Array;
      var currentContextIndex = 0;
      for (var k = 0; k < found.length; k++) {
        if (found[k].className && found[k].className.match(new RegExp('\\b'+className+'\\b'))) {
          currentContext[currentContextIndex++] = found[k];
        }
      }
      continue; // Skip to next token
    }
    // Code to deal with attribute selectors
    if (token.match(/^(\w*)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/)) {
      var tagName = RegExp.$1;
      var attrName = RegExp.$2;
      var attrOperator = RegExp.$3;
      var attrValue = RegExp.$4;
      if (!tagName) {
        tagName = '*';
      }
      // Grab all of the tagName elements within current context
      var found = new Array;
      var foundCount = 0;
      for (var h = 0; h < currentContext.length; h++) {
        var elements;
        if (tagName == '*') {
            elements = getAllChildren(currentContext[h]);
        } else {
            elements = currentContext[h].getElementsByTagName(tagName);
        }
        for (var j = 0; j < elements.length; j++) {
          found[foundCount++] = elements[j];
        }
      }
      currentContext = new Array;
      var currentContextIndex = 0;
      var checkFunction; // This function will be used to filter the elements
      switch (attrOperator) {
        case '=': // Equality
          checkFunction = function(e) { return (e.getAttribute(attrName) == attrValue); };
          break;
        case '~': // Match one of space seperated words 
          checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('\\b'+attrValue+'\\b'))); };
          break;
        case '|': // Match start with value followed by optional hyphen
          checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('^'+attrValue+'-?'))); };
          break;
        case '^': // Match starts with value
          checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) == 0); };
          break;
        case '$': // Match ends with value - fails with "Warning" in Opera 7
          checkFunction = function(e) { return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length); };
          break;
        case '*': // Match ends with value
          checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) > -1); };
          break;
        default :
          // Just test for existence of attribute
          checkFunction = function(e) { return e.getAttribute(attrName); };
      }
      currentContext = new Array;
      var currentContextIndex = 0;
      for (var k = 0; k < found.length; k++) {
        if (checkFunction(found[k])) {
          currentContext[currentContextIndex++] = found[k];
        }
      }
      // alert('Attribute Selector: '+tagName+' '+attrName+' '+attrOperator+' '+attrValue);
      continue; // Skip to next token
    }
    // If we get here, token is JUST an element (not a class or ID selector)
    tagName = token;
    var found = new Array;
    var foundCount = 0;
    for (var h = 0; h < currentContext.length; h++) {
      var elements = currentContext[h].getElementsByTagName(tagName);
      for (var j = 0; j < elements.length; j++) {
        found[foundCount++] = elements[j];
      }
    }
    currentContext = found;
  }
  return currentContext;
}

/* That revolting regular expression explained 
/^(\w+)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/
  \---/  \---/\-------------/    \-------/
    |      |         |               |
    |      |         |           The value
    |      |    ~,|,^,$,* or =
    |   Attribute 
   Tag
*/
/** END getElementsBySelector CODE ********************************************/

// Alias old DomUtils.getElementsBySelector to this same function
// in order to maintain compatibility if anyone was using the old one
DomUtils.getElementsBySelector = document.getElementsBySelector;






function EventManager() {

    window.onload = null;
    window.onunload = null;
//    this.addEvent    = EventManager_AddEvent;
//    this.removeEvent = EventManager_RemoveEvent;
//    this.addOnLoad   = EventManager_AddOnLoad;
//    this.addOnUnload = EventManager_AddOnUnload;
//    this.addOnResize = EventManager_AddOnResize;
    
    
    
    this.alterEventObject = function(e) { };
    
    
    var registry      = {};
    var targetIdCount = 0;

    function registryKey(id, type, fn) {
        return id+'#'+type+'#'+fn;
    }

    function isInRegistry(key) {
        return registry[key] != null;
    }

    function invoke(key, evt) {
        if (!isInRegistry(key)) return null;
        if (window.eventManager) {
            var _evt = window.eventManager.alterEventObject(evt);
            if (typeof(_evt) == 'object') evt = _evt;
            var handler = registry[key];
            var scope   = handler.scope;
            scope.__EventManager_Listener__ = handler.listener;
            scope.__EventManager_Listener__(evt);
            scope.__EventManager_Listener__ = null;
            return true;
        } else {
            return false;
        }
    }

    function targetId(target) {
        if (target == document)      return "__EventManager_ID_document";
        if (target == window)        return "__EventManager_ID_window";
        if (target+'' == xmlhttp+'') return "__EventManager_ID_xmlhttp";
        try {
            var id = target.getAttribute('id') || target.uniqueID;
            if (id == null) {
                id = "__EventManager_ID_"+(targetIdCount++);
                target.setAttribute('id', id);
            }
        } catch (e) {
//            throw new Error('target: "'+target+'" vs xmlhttp: "'+xmlhttp+'"');
        }
        return id;
    }

    this.isEventRegistered = function(target, type, listener) {
            var key = registryKey(targetId(target), type, listener);
        return isInRegistry(key);
    }


    this.addEvent = function(target, type, listener, scope, capture) {
        var key, handler;
        key   = registryKey(targetId(target), type, listener);
        scope = scope || target;
        if (isInRegistry(key)) window.removeEvent(target, type, listener);
        handler = { listener: listener, scope: scope, capture: capture, invoker: function(evt) { invoke(key, evt); } };
        registry[key] = handler;
        if (target.addEventListener) target.addEventListener(type, handler.invoker, capture);
        else if (target.attachEvent) target.attachEvent('on'+type, handler.invoker);
        else                         return false;
        if (typeof(window.addOnUnload) == 'function') window.addOnUnload( function() { /*alert('calling window.removeEvent.');*/ window.removeEvent(target, type, listener); target = type = listener = null; } );
        scope = null;
        return true;
    }

    this.removeEvent = function(target, type, listener) {
        var key, invoker, capture;
        key = registryKey(targetId(target), type, listener);
        if (!isInRegistry(key)) return false;
        invoker       = registry[key].invoker;
        capture       = registry[key].capture;
        registry[key] = null;
        if (target.removeEventListener) target.removeEventListener(type, invoker, capture);
        else if (target.detachEvent)    target.detachEvent("on" + type, invoker);
        else                            return false;
        return true;
    }


//    this.handleOnload = function() {
//        for (var i=0; i<window.eventManager.onload.length; i++) {
//            window.eventManager.onload[i]();
//        }
//    }
    
//    this.addOnLoad = function(func) {
//        if (window.onload != this.handleOnload) {
//            window.eventManager.onload[window.eventManager.onload.length] = window.onload;
//            window.onload = this.handleOnload;
//        }
//        window.eventManager.onload[window.eventManager.onload.length] = func;
////        if (typeof(window.onload) != 'function') window.onload = func;
////        else {
////            var oldLoad = window.onload;
////            window.onload = function() {
////                oldLoad();
////                func();
////            }
////        }
//    }
    
//    this.addOnUnload = function(func) {
//        if (typeof(window.onunload) != 'function') window.onunload = func;
//        else {
//            var oldUnload = window.onunload;
//            window.onunload = function() {
//                alert('running '+oldUnload);
//                oldUnload();
//                alert('running '+func);
//                func();
//            }
//        }
//    }
    
    this.addOnResize = function(func) {
        if (typeof(window.onresize) != 'function') window.onresize = func;
        else {
            var oldResize = window.onresize;
            window.onresize = function() {
                oldResize();
                func();
            }
        }
    }
    
    return this;
}

EventManager.prototype             = new Object;
EventManager.prototype.constructor = EventManager;
EventManager.superclass            = Object.prototype;

window.eventManager = new EventManager();
window.EventManager = window.eventManager;

function EventManager_CleanWindow() {
    window.onafterprint   = null;
    window.onbeforeprint  = null;
    window.onbeforeunload = null;
    window.onblur         = null;
    window.ondragdrop     = null;
    window.onerror        = null;
    window.onfocus        = null;
    window.onhelp         = null;
    window.onload         = null;
    window.onmove         = null;
    window.onresize       = null;
    window.onscroll       = null;
    window.onunload       = null;
}

EventManager.instance = null;
EventManager.getInstance = function() {
    if (!EventManager.instance) EventManager.instance = new EventManager();
    return EventManager.instance;
}

/**
 * Methods opened up to the window object:
 *
 *   addEvent
 *   removeEvent
 *   addOnload
 *   addOnUnload
 *   addOnResize
 *
 */

window.addEvent = function(target, type, listener, scope, capture) {
    if (window.eventManager) window.eventManager.addEvent(target, type, listener, scope, capture);
    else return false;
}

window.removeEvent = function(target, type, listener) {
    if (window.eventManager) window.eventManager.removeEvent(target, type, listener);
    else return false;
}

window.isEventRegistered = function(target, type, listener) {    
    if (window.eventManager) return window.eventManager.isEventRegistered(target, type, listener);
    else return false;
}





/**
 * Handles for multiple onLoad functions.
 */
window.loadQueue = new Array();
// Alias the names so it makes sense for everyone
window.addOnLoad = window.addOnload = function Window_AddOnLoad(func) {
    if (!(window.onload instanceof Function)) {
        if (window.onload) {
            var oldOnload = window.onload;
            window.loadQueue.push(function() { oldOnload });
        }
        window.onload = Window_OnLoadQueue;
    } else if (window.onload !== Window_OnLoadQueue) {
        loadQueue.push(window.onload);
        window.onload = Window_OnLoadQueue;
    }
    var sz = window.loadQueue.length;
    window.loadQueue[sz] = func;
}
function Window_OnLoadQueue() {
    for (var i=0; i<window.loadQueue.length; i++) {
        var loadFunc = window.loadQueue[i];
        loadFunc();
    }
}
window.onload = Window_OnLoadQueue;








/**
 * Handles for multiple onUnload functions.
 */
window.unloadQueue = new Array();
function Window_OnUnloadQueue() {
    for (var i=0; i<window.unloadQueue.length; i++) {
        var unloadFunc = window.unloadQueue[i];
        unloadFunc();
    }
    /**
     * Google Maps API Version 2 introduced a javascript
     * closure cleanup function... call it if its defined.
     */ 
    if (typeof(GUnload) == 'function') GUnload();
    // Cleanup event manager memory space
    window.onload       = null;
    window.onunload     = null;
    window.onresize     = null;
    window.eventManager = null;
    window.EventManager = null;
}
// Alias the names so it make sense for everyone
window.addOnunload = window.addOnUnLoad = window.addOnUnload = function Window_AddOnUnload(func) {
    if (!(window.onunload instanceof Function)) {
        if (window.onunload) {
            var oldUnload = window.onunload;
            window.unloadQueue.push(function() { oldUnload });
        }
        window.onunload = Window_OnUnloadQueue;
    } else if (window.onunload !== Window_OnUnloadQueue) {
        window.unloadQueue.push(window.onunload);
        window.onunload = Window_OnUnloadQueue;
    }
    window.unloadQueue.push(func);
}
window.onunload = Window_OnUnloadQueue;










window.addOnResize = function(func) {
    if (window.eventManager) window.eventManager.addOnResize(func);
    else return false;
}



if (typeof window.addOnUnload == 'function') window.addOnUnload(EventManager_CleanWindow);









/**
 * I have to instantiate an XMLHttpRequest
 * in order to come up with a valid id for them in the event manager.
 */
var xmlhttp = null;
try {
    xmlhttp = new ActiveXObject('Msxml2.XMLHTTP');
} catch (e) {
    try {
        xmlhttp = new ActiveXObject('Microsoft.XMLHTTP');
    } catch (e) {
        try {
            xmlhttp = new XMLHttpRequest();
        } catch (e) {
            //this.request = new IframeHttpRequest();
            xmlhttp = null;
        }
    }
}



var AJAX_REQUEST = {
    DEBUG:           false,
    DEFAULT_ASYNC:   false,
    DEFAULT_METHOD:  'POST',
    DEFAULT_URL:     baseurl + 'rpcServer.php',
    MAX_REQUESTS:    10,
    REQUEST_TIMEOUT: 30000
}
if (!window.ajax)  {
    window.ajax = {
        NEXT_ID:        0,
        COUNT:          0,
        MAX_CONCURRENT: AJAX_REQUEST.MAX_REQUESTS
    };
}

function AjaxRequest(method, url, async, requestTimeout, user, password) {

    this.abort = function() {
        if (AJAX_REQUEST.DEBUG && typeof(writeDebug) == 'function') writeDebug('AjaxRequest.abort() called.');
        if (this.request && this.busy) {
            if (window.ajaxRequests && window.ajaxTimers && this.requestId >= 0) {
                if (AJAX_REQUEST.DEBUG && typeof(writeDebug) == 'function') writeDebug('abort(): clearing timeout: '+self.requestId+', timerId: '+window.ajaxTimers[self.requestId]);
                clearTimeout(window.ajaxTimers[this.requestId]);
                window.ajaxTimers[this.requestId] = null;
                window.ajaxRequests[this.requestId] = null;
            }
            this.request.onreadystatechange = function() { }; // Clear it for IE
            this.request.abort();
            this.request = null;
            this.busy    = false;
            window.ajax.COUNT--;
        }
    }
    this.send  = function() {
        try {
            this.request = new ActiveXObject('Msxml2.XMLHTTP');
        } catch (e) {
            try {
                this.request = new ActiveXObject('Microsoft.XMLHTTP');
            } catch (e) {
                try {
                    this.request = new XMLHttpRequest();
                } catch (e) {
                    this.request = null;
                }
            }
        }
        if (this.request) {
            var url     = this.url;
            if (this.async && this.callback) {
                this.request.onreadystatechange = this.onStateChange;
                if (this.requestTimeout != null && this.timeout > 0 && this.requestId == null) {
                    if (window.ajax.COUNT < window.ajax.MAX_CONCURRENT) {
                        this.requestId = window.ajax.NEXT_ID++;
                        window.ajax.COUNT++;
                    } else {
                        alert('Too many concurrent ajax requests.');
                        return false;
                    }
                    if (AJAX_REQUEST.DEBUG && typeof(writeDebug) == 'function') writeDebug('XmlHttpRequest '+this.requestId+' setting timeout: '+this.requestTimeout);
                    self.requestTimer = setTimeout(function() { self.abort(); self.requestTimer = null; if (typeof(writeDebug) == 'function') writeDebug('XmlHttpRequest '+self.requestId+' aborted.'); }, this.requestTimeout);
                }
            }
            if (this.method == 'POST') {
                this.request.open(this.method, this.url, this.async, this.user, this.password);
                this.request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=windows=1251');
                this.busy = true;
                
                this.request.send(this.params.join('&'));
            } else {
                url = this.url+(this.params.length > 0 ? '?'+this.params.join('&') : '');
                this.request.open(this.method, url, this.async, this.user, this.password);
                this.request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=windows=1251'); 
                this.busy = true;
                this.request.send('');
            }

            if (!this.async) {
                this.busy = false;;
                return this.request.responseXML;
            }
        }
    }

    this.setParameter = function(name, value) {
        if (AJAX_REQUEST.DEBUG && typeof(writeDebug) == 'function') writeDebug('AjaxRequest.setParameter('+name+', '+value+') called.');
        this.params.push(name+'='+encodeURIComponent(value));
    }

    this.setResponseType = function(ResponseType){
       this.ResponseType = (ResponseType=='html' ? 'html' : 'xml');
    }

    this.setCallback = function(func) {
        if (typeof(func) == 'function') this.callback = func;
        else                            alert('Unable to set callback handler. Must be a function.');
    }

    this.onStateChange = function() {
        if (self.request && self.request.readyState && self.request.readyState == 4) {
            if (self.requestTimer && self.requestId) {
                if (AJAX_REQUEST.DEBUG && typeof(writeDebug) == 'function') writeDebug('XmlHttpRequest '+this.requestId+' clearing timeout.');
                clearTimeout(self.requestTimer);
                self.requestTimer = null;
                self.requestId    = null;
            }
            self.busy = false;
            if (AJAX_REQUEST.DEBUG && typeof(writeDebug) == 'function') writeDebug('XmlHttpRequest.reponseText: '+self.request.responseText);
//            console.log(self.request.responseText);
            if(self.ResponseType && self.ResponseType=='html'){
               self.callback(self.request.responseText);
            }else{
               self.callback(self.request.responseXML);
            }
        }
    }



    this.method         = method          || AJAX_REQUEST.DEFAULT_METHOD;
    this.url            = url             || AJAX_REQUEST.DEFAULT_URL;
    this.async          = async           || AJAX_REQUEST.DEFAULT_ASYNC;
    this.requestTimeout = requestTimeout  || AJAX_REQUEST.REQUEST_TIMEOUT;
    this.user           = user            || null;
    this.password       = password        || null;
    this.callback       = null;
    this.params         = new Array;
    this.request        = null;
    this.requestTimer   = null;
    this.ResponseType   = 'xml'; // html or xml



    /**
     * JavaScript Closure Variable
     */
    var self = this;

}