function getPosts(){ 
xmlHttp2=GetXmlHttpObject() 
if (xmlHttp2==null){ 
alert ("Browser does not support HTTP Request") 
return // Returns.
} 
var url2="chat.getmessages.php"
xmlHttp2.open("GET",url2,true) 
xmlHttp2.onreadystatechange = function () { 
if (xmlHttp2.readyState == 4) { 
if (xmlHttp2.status == 200) {
document.getElementById("chatmessages").innerHTML = xmlHttp2.responseText;
} 
} 
}; 
xmlHttp2.send(null);
} 

getPosts();
setInterval("getPosts()",5000);