//Change Log:
//* Updated: July 11th, 07: Fixed bug with persistence not working. Doh.
//* Updated: July 9th, 07: Added session only persistence to tabs (set "enabletabpersistence" var below). Only .js file changed.
//* Updated Nov 8th, 06. Ability to select a tab dynamically, by calling a method (ie: via a link). Only .js file changed.

var bustcachevar=1 //bust potential caching of external pages after initial request? (1=yes, 0=no)
var loadstatustext=" Requesting content..."
var enabletabpersistence=1 //enable tab persistence via session only cookies, so selected tab is remembered (1=yes, 0=no)?

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



function ajaxpage2(url,containerid,id)
{var page_request = false
 if (window.XMLHttpRequest) // if Mozilla, IE7, 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
 
 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, true)
 page_request.send(null)
 return false;
 
}



function ajaxpage(url, containerid, targetobj)
{var page_request = false
 if (window.XMLHttpRequest) // if Mozilla, IE7, 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
        var persisttabindex=(enabletabpersistence==1)? parseInt(getCookie(arguments[i])) : "" //get index of persisted tab (if applicable)
		
 
        var isvalidpersist=(persisttabindex<ulist.length)? true : false //check if persisted tab index falls within range of defined tabs
        for (var x=0; x < ulist.length; x++)
		    { //loop through each LI element
              var ulistlink=ulist[x].getElementsByTagName("a")[0]
              ulistlink.index=x
              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
				  
				  //Set a function for the "Onclick" event
                  ulistlink.onclick = function()
				                      {ajaxpage(this.getAttribute("href"), this.getAttribute("rel"), this)
                                       loadobjs(this.getAttribute("rev"))
                                       saveselectedtabindex(this.parentNode.parentNode.id, this.index)
                                       return false
                                      }
                  if ((enabletabpersistence==1 && persisttabindex < ulist.length && x==persisttabindex) || (enabletabpersistence==0 && 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
                     }
                 }
            }
     }
}


////////////Persistence related functions//////////////////////////

function saveselectedtabindex(ulid, index){ //remember currently selected tab (based on order relative to other tabs)
if (enabletabpersistence==1) //if persistence feature turned on
setCookie(ulid, index)
}

function getCookie(Name){ 
var re=new RegExp(Name+"=[^;]+", "i"); //construct RE to search for target name/value pair
if (document.cookie.match(re)) //if cookie found
return document.cookie.match(re)[0].split("=")[1] //return its value
return ""
}

function setCookie(name, value){
document.cookie = name+"="+value //cookie value is domain wide (path=/)
}