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Not too clued up on AJAX but the following scripts seems to work in safari, chrome, opera, firefox and seamonkey but in internet explorer 8 it refreshes once then does nothing else all the others update every 20 seconds internet explorer is showing no javascript errors???

 

<script type="text/javascript">
function Ajax(){
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) {
     if(xmlHttp.status == 200) {
	document.getElementById('usersonline').innerHTML=xmlHttp.responseText;
	setTimeout('Ajax()',"20000");
}
}
}
      var sessid= "<?=$sessid?>";
xmlHttp.open("GET", "topmain.php?sessid="+sessid, true);
xmlHttp.send(null); 
}
window.onload=function(){
setTimeout('Ajax()',"20000");
}
</script>


</head>
<body>

<div id="wrapper">

<div id="headertopleft">
<div id="usersonline"><?php include_once("topmain.php"); ?></div>
</div>

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https://forums.phpfreaks.com/topic/199356-ajax-not-working-in-internet-explorer-8/
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solved it i just needed to add a header request to stop internet explorer caching.

 

i just added setRequestHeader

 

      var sessid= "<?=$sessid?>";
      xmlHttp.open("GET", "online.php?sessid="+sessid, true);
      xmlHttp.setRequestHeader("If-Modified-Since", "Sat, 1 Jan 2000 00:00:00 GMT");
      xmlHttp.send(null); 

 

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