var bustcachevar=1; //bust potential caching of external pages after initial request? (1=yes, 0=no)
var loadstatustext="<img src='images/loading.gif' /> Requesting content...";

////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("Msxml2.XMLHTTP")
	  } 
	  catch (e){
		try{
		  page_request = new ActiveXObject("Microsoft.XMLHTTP")
		}
		catch (e){}
	  }
	}
	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]
	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 expandtab(tabcontentid, tabnumber){ //interface for selecting a tab (plus expand corresponding content)
  var thetab=document.getElementById(tabcontentid).getElementsByTagName("a")[tabnumber]
//  alert(eval(thetab+'.name'));
  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
		}
	  }
	}
  }
}