Opdatering af chat automatisk Javascript

var xmlHttp

function henttags(str)
{
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
{
alert ("Din browser er for gammel.");
return;
}
var url="din fil der skal opdatere";
url=url+"?sid="+Math.random();
xmlHttp.onreadystatechange=stateChanged;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);

setTimeout("henttags();",5000);
}

function henttags2(str)
{
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
{
alert ("Din browser er for gammel.");
return;
}
var url="siden den skal hente fra";
url=url+"?sid="+Math.random();
xmlHttp.onreadystatechange=stateChanged;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
}

function stateChanged()
{
if (xmlHttp.readyState==4)
{
if (xmlHttp.responseText.length > 0) {
document.getElementById("tags").innerHTML=xmlHttp.responseText;
}
}
}
function GetXmlHttpObject()
{
var xmlHttp=null;
try
{
// Firefox, Opera 8.0+, Safari
xmlHttp=new XMLHttpRequest();
}
catch (e)
{
// Internet Explorer
try
{
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e)
{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
}
return xmlHttp;
}
setTimeout("henttags();",100);