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

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

function ajaxpage(url, containerid, targetobj){
  //alert('url=' + url + ',containerid=' + containerid + ',targetobj=' + 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");
  //alert(ullist + ',len=' + ullist.length);
  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(qualifyHREF(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 (typeof(ulistlink) != 'undefined' && 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.onmouseover=function(){
          ajaxpage(qualifyHREF(this.getAttribute("href")), this.getAttribute("rel"), this);
          loadobjs(this.getAttribute("rev"));
          return false;
        }

        ulistlink.onclick=function(){
          ajaxpage(qualifyHREF(this.getAttribute("href")), this.getAttribute("rel"), this);
          loadobjs(this.getAttribute("rev"));
          return false;
        }

        if (ulist[x].className=="selected"){
          ajaxpage(qualifyHREF(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
        }
      }
    }
  }
}