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

////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]
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+":"+window.location.port+"/")
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
}
}
}
}
}