var objPreviousLink = null;
					
//The following lines preload the menu images		
var imgPixel = new Image(31,16);
var imgLine = new Image(31,16);
var imgDocJoin = new Image(31,16);
var imgDoc = new Image(31,16);
var imgPlusOnly = new Image(31,16);
var imgMinusOnly = new Image(31,16);
var imgFolderOpen = new Image(31,16);
var imgFolderOpen_top = new Image(31,16);
var imgFldrClosed = new Image(31,16);
var imgFldrClosed_top = new Image(31,16);
var imgFldrClosedJoinempty = new Image(31,16);
var imgFldrClosedempty = new Image(31,16);

/*
imgPixel.src = "/images/pixel.gif";
imgLine.src = "/images/line.gif";
imgDocJoin.src = "/images/docjoin.gif";
imgDoc.src = "/images/doc.gif";
imgPlusOnly.src = "/images/plusonly.gif";
imgMinusOnly.src = "images/minusonly.gif";
imgFolderOpen.src ="/images/folderopen.gif";
imgFldrClosed.src = "/images/folderclosed.gif";
imgFldrClosedJoinempty = "/images/folderclosedjoin-empty.gif";
imgFldrClosedempty = "/images/folderclosed-empty.gif";  
*/

imgPixel.src = "/images/pixel.gif";
imgLine.src = "/images/line.gif";
imgDocJoin.src = "/images/docjoin.gif";
imgDoc.src = "/images/doc.gif";

imgPlusOnly.src = "/images/plusonly.gif";
imgMinusOnly.src = "/images/minusonly.gif";

imgFolderOpen.src = "/images/folderopen.gif";
imgFolderOpen_top.src = "/images/folderopen_top.gif";
imgFldrClosed.src = "/images/folderclosed.gif";
imgFldrClosed_top.src = "/images/folderclosed_top.gif";
imgFldrClosedJoinempty = "/images/folderclosedjoin-empty.gif";
imgFldrClosedempty = "/images/folderclosed-empty.gif";  

function linkTo(url)
{
// To avoid of showing variables in the link, we submit the form to a mid_land.asp, collect variables there, then redirect to the page that we realy want to go to.
var objForm; 
objForm = document.forms["frmMenu"]; 
objForm.action = url
objForm.target = "_self"
objForm.method = "POST" 
objForm.submit();
//alert(document.frmMenu.hdnOpenLev1.value + " | " + document.frmMenu.hdnOpenLev2.value + " | " + document.frmMenu.hdnOpenLev3.value );
//var v = document.frmMenu.hdnOpenFolders.value;
//document.location.href= url + '?hdnOpenFolders=' + v  + '&hdnOpenLev1=' + document.frmMenu.hdnOpenLev1.value + '&hdnOpenLev2=' + document.frmMenu.hdnOpenLev2.value +'&hdnOpenLev3=' + document.frmMenu.hdnOpenLev3.value;
}

function switchImg(srcElement,targetElement)
{   
   /* if (srcElement.src.indexOf(imgFolderOpen.src) != -1)
    alert(	srcElement.src + ' | ' + imgFolderOpen.src);	
    
	if (targetElement.style.display != "none")
	{
		//Our menu item is currently hidden, so display it
		//targetElement.style.display = "";
							
		if (srcElement.className == "LEVEL3_1")
			//Set a special open-folder graphic for the root folder
			return imgFolderOpen_top.src;
		else
			//Otherwise, just show the standard icon
			return imgFolderOpen.src;
				
		//fnAddItem(document.frmMenu.hdnOpenFolders, srcElement.id);
	}
	else
	{
		//Our menu item is currently visible, so hide it
		//targetElement.style.display = "none";
							
		if (srcElement.className == "LEVEL3_1")
			//Set a special closed-folder graphic for the root folder
			return  imgFldrClosed_top.src;
		else
			//Otherwise, just show the standard icon
			return  imgFldrClosed.src;
	}			
	*/	

   //if (srcElement.src == "images/folderclosed_top.gif")
    if (srcElement.src.indexOf("images/folderclosed_top.gif") != -1)
    return imgFolderOpen_top.src;	
	
	//if (srcElement.src == "images/folderopen_top.gif")
	if (srcElement.src.indexOf("images/folderopen_top.gif") != -1)
	return imgFldrClosed_top.src;
	
	//if (srcElement.src == "images/folderopen.gif")
	if (srcElement.src.indexOf("images/folderopen.gif") != -1)
	return imgFldrClosed.src;	
	
	//if (srcElement.src == "images/folderclosed.gif")
	if (srcElement.src.indexOf("images/folderclosed.gif") != -1)
	return imgFolderOpen.src;	
	
	//if (srcElement.src == "images/plusonly.gif")
	if (srcElement.src.indexOf("images/plusonly.gif") != -1)
	return imgMinusOnly.src;
		
	//if (srcElement.src == "images/minusonly.gif")
	if (srcElement.src.indexOf("images/minusonly.gif") != -1)
	return imgPlusOnly.src;	
	
}
		
//This function queries the arClickedElementID[] and arAffectedMenuItemID[] arrays
//to get an object reference to the appropriate menu element to show or hide.
function fnLookupElementRef(sID, arClickedElementID, arAffectedMenuItemID)
{
	var i;
	for (i=0;i<arClickedElementID.length;i++)
		if (arClickedElementID[i] == sID)
		  
			return document.getElementById(arAffectedMenuItemID[i]);
								
	return null;
}
function fnLookupElementRef2(sID, arClickedElementID, arAffectedMenuItemID)
{
	var i;
	for (i=0;i<arAffectedMenuItemID.length;i++)
		if (arAffectedMenuItemID[i] == sID)
		  // alert(arAffectedMenuItemID[i]);
			return document.getElementById(arClickedElementID[i]);
								
	return null;
}		
//This function is responsible for showing/hiding the menu items.  It
//also switches the images accordingly
function doChangeTree(e, arClickedElementID, arAffectedMenuItemID)
{
	/////alert ("changetree")
    var targetID, srcElement, targetElement;
	srcElement = e;
	
	if (srcElement != null)			
		//Only work with elements that have LEVEL in the classname
		if(srcElement.className.substr(0,5) == "LEVEL") 
		{
			//Using the ID of the item that was clicked, we look up
			//and retrieve an object reference to the menu item that
			//should be shown or hidden
			targetElement = fnLookupElementRef(srcElement.id, arClickedElementID, arAffectedMenuItemID)		
									
			if (targetElement != null)
			{
				fnChangeFolderStatus(srcElement, targetElement,arClickedElementID, arAffectedMenuItemID);

				//If we have a value in the MODE field, it means we are clicking
				//on a site.  We should submit the menu so we can retrieve the
				//data for that site and rebuild the tree 
				//if (srcElement.name == 'LoadOnDemand')
				//{
				//	//We submit the menu only if the tree is being expanded.  
				//	if (targetElement.style.display == "")
				//		document.frmMenu.submit();
				//}
			}
		}
}



	
		//*************************************************
		function closeFolder(srcElement,arClickedElementID, arAffectedMenuItemID)
		{
		
		  	//alert(document.frmMenu.hdnOpenLev1.value + " | " + document.frmMenu.hdnOpenLev2.value + " | " + document.frmMenu.hdnOpenLev3.value );

			var curOpenLev1=document.frmMenu.hdnOpenLev1.value;
			var curOpenLev2=document.frmMenu.hdnOpenLev2.value;	
			var curOpenLev3=document.frmMenu.hdnOpenLev3.value;
		
		  var curOpenLev;
		  var level = srcElement.className.substr(srcElement.className.indexOf("_")+1,1);
		  var sID = srcElement.id;
		  if ( level == "1" )
		  {
		   	curOpenLev = curOpenLev1;
			document.frmMenu.hdnOpenLev1.value = sID;
		  }
		  if ( level == "2" )
		  {
			curOpenLev = curOpenLev2;
			document.frmMenu.hdnOpenLev2.value = sID;
		  }
	      if ( level == "3" )
		  {
		    curOpenLev = curOpenLev3;
			document.frmMenu.hdnOpenLev3.value = sID;
		  }
			if (curOpenLev != "")
	        {
	            
				var objItem, objTargetItem;				  
				objItem = document.getElementById(curOpenLev);
				
				if ( objItem != null ) 
	            {
				objTargetItem = fnLookupElementRef(objItem.id, arClickedElementID, arAffectedMenuItemID);
				
				fnChangeFolderStatus2(objItem, objTargetItem);
				}
	        }					
		}

		//*************************************************
		
		

//Opens a closed folder and closes an open folder.  This function
//is responsible for all aspects of changing the folder status.
//Attributes are as follows:
//-------------------------------
//srcElement : Object reference to the folder that should be expanded/contracted
//targetElement : Object reference to the subfolder that should be displayed/hidden
function fnChangeFolderStatus(srcElement, targetElement,arClickedElementID, arAffectedMenuItemID)
{
	/////alert(srcElement.className)
	if (srcElement != null) 
	{
		//First find out if the current folder is empty
		//We find out based on the name of the image used
		if (srcElement.tagName == 'IMG')
		{
			var sImageSource = srcElement.src;
			if (sImageSource.indexOf("empty") == -1)
			{
			    
				if (targetElement.style.display == "none")
				{
			  	//alert("click1");
				    // only one node can be expanded at a time , so close the others
				    closeFolder(srcElement,arClickedElementID, arAffectedMenuItemID);
				//alert("click3");
					//Our menu item is currently hidden, so display it
					targetElement.style.display = "";				
					srcElement.src = switchImg(srcElement,targetElement);	 			
				
					//fnAddItem(document.frmMenu.hdnOpenFolders, srcElement.id);
					fnAddItem(srcElement);
			    //alert("click5");
					//curOpenLev1 = srcElement.id;													
				}
				else
				{	
				//alert("click2");
					//Our menu item is currently visible, so hide it
					targetElement.style.display = "none";	
					srcElement.src = switchImg(srcElement,targetElement);	 
				//alert("click9"); 	
					//fnRemoveItem(document.frmMenu.hdnOpenFolders, srcElement.id);
					fnRemoveItem(srcElement);
				 }
			}
		} 
	}
}
//Adds the current element ID to the hidden field.
function fnAddItem(srcElement)
{
 var level = srcElement.className.substr(srcElement.className.indexOf("_")+1,1);
	 var sID = srcElement.id;
	if ( level == "1" )
	{
	document.frmMenu.hdnOpenLev1.value = sID;
	}
	if ( level == "2" )
	{
	document.frmMenu.hdnOpenLev2.value = sID;
	}
	if ( level == "3" )
	{
	document.frmMenu.hdnOpenLev3.value = sID;
	}
}
//delete the current element ID from the hidden field
function fnRemoveItem(srcElement)
{
    var level = srcElement.className.substr(srcElement.className.indexOf("_")+1,1);
	//var sID = srcElement.id;
	if ( level == "1" )
	{
	document.frmMenu.hdnOpenLev1.value = "";
	}
	if ( level == "2" )
	{
	document.frmMenu.hdnOpenLev2.value = "";
	}
	if ( level == "3" )
	{
	document.frmMenu.hdnOpenLev3.value = "";
	}
	
}
/*
//Adds the current element ID to a string stored in hidden HTML field.
//Only adds the ID if it is not already in there
function fnAddItem(objField, sElementID)
{
	var sCurrValue = ',' + objField.value + ',';
	var sElementIDQuoted = ',' + sElementID + ',';
    //alert("sCurrValue=" + sCurrValue + " | " + "sElementID=" + sElementID);
	if (sCurrValue.indexOf(sElementIDQuoted) == -1)
		objField.value = objField.value + ',' + sElementID;
}
//Removes a specific element ID from a string stored in hidden HTML field.
function fnRemoveItem(objField, sElementID)
{
	var sCurrValue = objField.value;
	var arValues = sCurrValue.split(',');
	var arNewValues = new Array(0);
	var x=0;	
	for (i=0;i<arValues.length;i++)
		if (arValues[i] != sElementID)
		{
			arNewValues[x] = arValues[i];
			x++;
		}		
	sCurrValue = arNewValues.join(',');
	objField.value = sCurrValue;
}
*/

// close folders only
function fnChangeFolderStatus2(srcElement, targetElement)
{
//alert("change")
	if (srcElement != null) 
	{
		//First find out if the current folder is empty
		//We find out based on the name of the image used
		if (srcElement.tagName == 'IMG')
		{
			var sImageSource = srcElement.src;
			if (sImageSource.indexOf("empty") == -1)
			{	    
				if (targetElement.style.display != "none")
					{				
					//Our menu item is currently visible, so hide it
					targetElement.style.display = "none";
					// swith the folder icon image
					//alert('start switch');
					srcElement.src = switchImg(srcElement,targetElement);	 
					
					//alert('end switch');
					//fnRemoveItem(document.frmMenu.hdnOpenFolders, srcElement.id);
					fnRemoveItem(srcElement);
				}
			}
		} 
	}
}
//This function highlights the text of a menu item.
//It also deselects the previously
//selected menu item.  It takes three parameters: 1) an
//object reference to the selected link, and 2) an 
//object reference to the previously selected link.  The
//function returns a reference to the currently selected link.
function fnSelectItem(objSelectedLink, objPreviousLink)
{	
	var bFound = false;
				
	//If we have previously selected a menu item, deselect it
	if (objPreviousLink != null)
		fnDeselectItem(objPreviousLink);
					
	//Find an object reference for our TD tag
	var objTD = objSelectedLink;
	while (objTD.tagName!="TD")
	{
		objTD=objTD.parentElement;
						
		if (objTD.tagName == "TD")
			bFound = true;
	}
					
	//Got the TD tag reference, so now highlight the cell	
	if (bFound == true)
	{
		objTD.className = "selected";
	}
					
	//Return reference to our selected item
	return objSelectedLink;
}
		
//This function removes the highlight from a
//previously selected menu item.  It takes an
//object reference to the item that needs deselecting.
function fnDeselectItem(objPreviousLink)
{
	if (objPreviousLink !=  null)
	{
		//Find an object reference for our TD tag
		var objTD = objPreviousLink;
		while (objTD.tagName!="TD")
			objTD=objTD.parentElement;
					
		//Change the style class for the TD tag 
		//back to normal
		objTD.className = "node";
	}
}