try this:
<html>
<body>
<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){
document.getElementById('ReloadThis').innerHTML=xmlHttp.responseText;
setTimeout('Ajax()',10000);
}
}
xmlHttp.open("GET","http://www.example.com/the_page_that_contains_the_div_content",true);
xmlHttp.send(null);
}
window.onload=function(){
setTimeout('Ajax()',10000);
}
</script>
<div id="ReloadThis">Default text</div>
</body>
</html>
hope it helps :)
for further queries comment here!