var bustcachevar=0; // bust potential caching of external pages after initial request? (1=yes, 0=no)
var loadstatustext="<div class='window-style'>Loading ...</div>";

////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()
	else if (window.ActiveXObject){ // if IE
		try {
			page_request = new ActiveXObject("MSXML3.XMLHTTP")
		} catch (e){
			try {
				page_request = new ActiveXObject("Msxml2.XMLHTTP")
			} catch (e){
				try {
					page_request = new ActiveXObject("Msxml2.XMLHTTP.4.0")
				} catch (e){
					try {
						page_request = new ActiveXObject("MSXML2.XMLHTTP.3.0")
					} catch (e){
						try {
							page_request = new ActiveXObject("Microsoft.XMLHTTP")
						} catch (e){
							alert("XMLHTTP object not found.");
							return false;
						}
					}
				}
			}
		}
	} else
		return false;
	
	var ullist=targetobj.parentNode.parentNode.parentNode.getElementsByTagName("li");
	for (var i=0; i<ullist.length; i++)
		ullist[i].className="";  //deselect all tabs
	targetobj.parentNode.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];
		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);
}

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