var bustcachevar=1; //bust potential caching of external pages after initial request? (1=yes, 0=no)

var loadstatustext="<TABLE cellspacing=15><TR><TD><img src='../images/loading.gif' width='16' height='16' /></TD><TD> Requesting content, please wait...</TD></TR></TABLE>";

////NO NEED TO EDIT BELOW////////////////////////
var loadedobjects="";
var defaultcontentarray=new Object();
var bustcacheparameter="";

//=====================================//
function ajaxpage(url, containerid, targetobj)
{
	var page_request = false;
	if (window.XMLHttpRequest){ // if Mozilla, Safari etc
		page_request = new XMLHttpRequest();
		//window.alert("first one worked\n" + targetobj);
	}
	else if (window.ActiveXObject){ // if IE
		try {
			page_request = new ActiveXObject("Msxml2.XMLHTTP");
			//window.alert("second one worked\n" + targetobj);
		} 
		catch (e){
			try{
				page_request = new ActiveXObject("Microsoft.XMLHTTP");
				//window.alert("third one worked");
			}
			catch (e){
				//window.alert("nope, all failed");
			}
		}
	}
	else
		return false;

	var ullist=targetobj.parentNode.parentNode.getElementsByTagName("li");

	for (var i=0; i<ullist.length; i++)
	{
		ullist[i].className="";  //deselect all tabs
	}
	targetobj.parentNode.className="selected";  //highlight currently clicked on tab

	if (url.indexOf("#default")!=-1)
	{ //if simply show default content within container (verus fetch it via ajax)
		document.getElementById(containerid).innerHTML=defaultcontentarray[containerid];
		LoadRowRolloverListeners();
		return;
	}

	document.getElementById(containerid).innerHTML=loadstatustext;

	page_request.onreadystatechange=function()
	{
		loadpage(page_request, containerid);
	}

	if (bustcachevar) //if bust caching of external page
	{
		bustcacheparameter=(url.indexOf("?")!=-1)? "&"+new Date().getTime() : "?"+new Date().getTime();
	}
	page_request.open('GET', url+bustcacheparameter, true);
	page_request.send(null);

	//end function ajaxpage
}

//=====================================//
function loadpage(page_request, containerid)
{
	if (page_request.readyState == 4) // && (page_request.status==200 || window.location.href.indexOf("http")==-1))
		document.getElementById(containerid).innerHTML=page_request.responseText;
}

//=====================================//
function loadobjs(revattribute)
{
	if (revattribute!=null && revattribute!="")
	{ //if "rev" attribute is defined (load external .js or .css files)
		var objectlist=revattribute.split(/\s*,\s*/); //split the files and store as array
		for (var i=0; i<objectlist.length; i++)
		{
			var file=objectlist[i];
			var fileref="";
			if (loadedobjects.indexOf(file)==-1)
			{ //Check to see if this object has not already been added to page before proceeding
				if (file.indexOf(".js")!=-1)
				{ //If object is a js file
					fileref=document.createElement('script');
					fileref.setAttribute("type","text/javascript");
					fileref.setAttribute("src", file);
				}
				else if (file.indexOf(".css")!=-1)
				{ //If object is a css file
					fileref=document.createElement("link");
					fileref.setAttribute("rel", "stylesheet");
					fileref.setAttribute("type", "text/css");
					fileref.setAttribute("href", file);
				}
			}

			if (fileref!="")
			{
				document.getElementsByTagName("head").item(0).appendChild(fileref);
				loadedobjects+=file+" "; //remember this object as being already added to page
			}
		}
	}
}

//=====================================//
function expandtab(tabcontentid, tabnumber)
{ //interface for selecting a tab (plus expand corresponding content)
	var thetab=document.getElementById(tabcontentid).getElementsByTagName("a")[tabnumber];
	if (thetab.getAttribute("rel"))
	{
		ajaxpage(thetab.getAttribute("href"), thetab.getAttribute("rel"), thetab);
		loadobjs(thetab.getAttribute("rev"));
	}
}

//=====================================//
function savedefaultcontent(contentid)
{// save default ajax tab content
	if (typeof defaultcontentarray[contentid]=="undefined") //if default content hasn't already been saved
		defaultcontentarray[contentid]=document.getElementById(contentid).innerHTML;
}

//=====================================//
function startajaxtabs()
{
	for (var i=0; i<arguments.length; i++)
	{ //loop through passed UL ids
		var ulobj=document.getElementById(arguments[i]);
		var ulist=ulobj.getElementsByTagName("li"); //array containing the LI elements within UL
		for (var x=0; x<ulist.length; x++)
		{ //loop through each LI element
			var ulistlink=ulist[x].getElementsByTagName("a")[0];
			if (ulistlink.getAttribute("rel"))
			{
				var modifiedurl=ulistlink.getAttribute("href"); //.replace(/^http:\/\/[^\/]+\//i, "http://"+window.location.hostname+"/")
				ulistlink.setAttribute("href", modifiedurl); //replace URL's root domain with dynamic root domain, for ajax security sake
				savedefaultcontent(ulistlink.getAttribute("rel")); //save default ajax tab content
				ulistlink.onclick=function()
				{
					ajaxpage(this.getAttribute("href"), this.getAttribute("rel"), this);
					loadobjs(this.getAttribute("rev"));
					return false;
				}

				if (ulist[x].className=="selected")
				{
					ajaxpage(ulistlink.getAttribute("href"), ulistlink.getAttribute("rel"), ulistlink); //auto load currenly selected tab content
					loadobjs(ulistlink.getAttribute("rev")); //auto load any accompanying .js and .css files
				}
			}
		}
	}
}

//=====================================//