var imgHTTP=getreq(); 
function twitterXml()
{
    ctime=new Date();
    var url='/app/twitter-xml.aspx?utime='+ctime.getMilliseconds();
    imgHTTP.onreadystatechange=getxml;
    imgHTTP.open('GET',url,true); 
    imgHTTP.send(null);    
    var statusupdate=setTimeout("twitterXml()",900000);
}
function getxml()
{
    if(imgHTTP.readyState==4 ||imgHTTP.readyState=='Complete')
    {
        document.getElementById("divTwitter").innerHTML=imgHTTP.responseText;
    }
}
function getreq()
{ // returns false if exists
	if(window.ActiveXObject)
	 { // if IE
		try
		 {
		    return new ActiveXObject("Msxml2.XMLHTTP");
	    }
	    catch(e)
	    {
		    try
		    {
		        return new ActiveXObject("Microsoft.XMLHTTP");
		    }
		    catch(e)
		    {
		        return;
		    }
		}
	}
	else if(window.XMLHttpRequest)
	{ // if Mozilla, Safari, etc.
		return new XMLHttpRequest();
	}
}