var bustcachevar=1 //bust potential caching of external pages after initial request? (1=yes, 0=no)
var loadstatustext="<img src='img/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="submenuselected"  //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=="submenuselected"){
          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
        }
      }
    }
  }
}