Javascript load Page,load css,load js

/***********************************************
* Ajax Page Fetcher- by JavaScript Kit (www.javascriptkit.com)
***********************************************/

var ajaxpagefetcher={
loadingmessage: "Loading Page, please wait...",
exfilesadded: "",

connect:function(containerid, pageurl, bustcache, jsfiles, cssfiles){
 var page_request = false
 var bustcacheparameter=""
 if (window.XMLHttpRequest) // if Mozilla, IE7, Safari etc
  page_request = new XMLHttpRequest()
 else if (window.ActiveXObject){ // if IE6 or below
  try {
  page_request = new ActiveXObject("Msxml2.XMLHTTP")
  }
  catch (e){
   try{
   page_request = new ActiveXObject("Microsoft.XMLHTTP")
   }
   catch (e){}
  }
 }
 else
  return false
 var ajaxfriendlyurl=pageurl.replace(/^http:\/\/[^\/]+\//i, "http://"+window.location.hostname+"/")
 page_request.onreadystatechange=function(){ajaxpagefetcher.loadpage(page_request, containerid, pageurl, jsfiles, cssfiles)}
 if (bustcache) //if bust caching of external page
  bustcacheparameter=(ajaxfriendlyurl.indexOf("?")!=-1)? "&"+new Date().getTime() : "?"+new Date().getTime()
 document.getElementById(containerid).innerHTML=ajaxpagefetcher.loadingmessage //Display "fetching page message"
 page_request.open('GET', ajaxfriendlyurl+bustcacheparameter, true)
 page_request.send(null)
},

loadpage:function(page_request, containerid, pageurl, jsfiles, cssfiles){
 if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1)){
  document.getElementById(containerid).innerHTML=page_request.responseText
  for (var i=0; i<jsfiles.length; i++)
   this.loadjscssfile(jsfiles[i], "js")
  for (var i=0; i<cssfiles.length; i++)
   this.loadjscssfile(cssfiles[i], "css")
  this.pageloadaction(pageurl) //invoke custom "onpageload" event
 }
},

createjscssfile:function(filename, filetype){
 if (filetype=="js"){ //if filename is a external JavaScript file
  var fileref=document.createElement('script')
  fileref.setAttribute("type","text/javascript")
  fileref.setAttribute("src", filename)
 }
 else if (filetype=="css"){ //if filename is an external CSS file
  var fileref=document.createElement("link")
  fileref.setAttribute("rel", "stylesheet")
  fileref.setAttribute("type", "text/css")
  fileref.setAttribute("href", filename)
 }
 return fileref
},

loadjscssfile:function(filename, filetype){ //load or replace (if already exists) external .js and .css files
 if (this.exfilesadded.indexOf("["+filename+"]")==-1){ //if desired file to load hasnt already been loaded
  var newelement=this.createjscssfile(filename, filetype)
  document.getElementsByTagName("head")[0].appendChild(newelement)
  this.exfilesadded+="["+filename+"]" //remember this file as being added
 }
 else{ //if file has been loaded already (replace/ refresh it)
  var targetelement=(filetype=="js")? "script" : (filetype=="css")? "link" : "none" //determine element type to create nodelist using
  var targetattr=(filetype=="js")? "src" : (filetype=="css")? "href" : "none" //determine corresponding attribute to test for
  var allsuspects=document.getElementsByTagName(targetelement)
  for (var i=allsuspects.length; i>=0; i--){ //search backwards within nodelist for matching elements to remove
   if (allsuspects[i] && allsuspects[i].getAttribute(targetattr)!=null && allsuspects[i].getAttribute(targetattr).indexOf(filename)!=-1){
    var newelement=this.createjscssfile(filename, filetype)
    allsuspects[i].parentNode.replaceChild(newelement, allsuspects[i])
   }
  }
 }
},

pageloadaction:function(pageurl){
 this.onpageload(pageurl) //call customize onpageload() function when an ajax page is fetched/ loaded
},

onpageload:function(pageurl){
 //do nothing by default
},

load:function(containerid, pageurl, bustcache, jsfiles, cssfiles){
 var jsfiles=(typeof jsfiles=="undefined" || jsfiles=="")? [] : jsfiles
 var cssfiles=(typeof cssfiles=="undefined" || cssfiles=="")? [] : cssfiles
 this.connect(containerid, pageurl, bustcache, jsfiles, cssfiles)
}

} //End object

//Sample usage:
//1) ajaxpagefetcher.load("mydiv", "content.htm", true)
//2) ajaxpagefetcher.load("mydiv2", "content.htm", true, ["external.js"])
//3) ajaxpagefetcher.load("mydiv2", "content.htm", true, ["external.js"], ["external.css"])
//4) ajaxpagefetcher.load("mydiv2", "content.htm", true, ["external.js", "external2.js"])
//5) ajaxpagefetcher.load("mydiv2", "content.htm", true, "", ["external.css", "external2.css"])