var bustcachevar=1
var loadstatustext="<img src='images/base/loading.gif' /> Cargando contido..."

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+"/")
                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
                }
            }
        }
    }
}