Hello, I have a good ajax link code i found trawling the internet a few months ago, but recently i've needed to load JavaScript with it and have not been able to.

This is the link code:
Code:
<script type="text/javascript">
var bustcachevar=1 //bust potential caching of external pages after initial request? (1=yes, 0=no)
var loadedobjects=""
var rootdomain="http://"+window.location.hostname
var bustcacheparameter=""
function ajaxpage(url, containerid){
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
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(){
if (!document.getElementById)
return
for (i=0; i<arguments.length; i++){
var file=arguments[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
}
}
}
</script>
And this is the JavaScript i'm trying to load on my php page:

Code:
<script>
function ref1(){
var xmlhttp;
	try{	
		xmlhttp=new XMLHttpRequest();// Firefox, Opera 8.0+, Safari
	}
	catch (e){
		try{
			xmlhttp=new ActiveXObject("Msxml2.XMLHTTP"); // Internet Explorer
		}
		catch (e){
		    try{
				xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (e){
				alert("No AJAX!?");
				return false;
			}
		}
	}
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4)
    {
    document.getElementById("ref").innerHTML=xmlhttp.responseText;
	setTimeout("ref1()",1000);
    }
  }
xmlhttp.open("POST","timer.php",true);
xmlhttp.send();

}
window.onload=function(){
	setTimeout('ref1()',1000);
}
</script>
If you could tell me why my JavaScript don't work i'd appreciate it, and any fixes are welcome.

Sam.