Simple AJAX request & Field update

You can use this sample to make simple javascript AJAX request to update any textbox in any form arrays.

<script type="text/javascript">
function update_table()
{
gs = document.forms[0].referer.value;
var xmlhttp;
if (window.XMLHttpRequest)
{
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{
// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if(xmlhttp.readyState==4)
{
document.forms[0].update_field.value=xmlhttp.responseText;
}
}
xmlhttp.open("GET","ajax_server.php?get_value="+gs,true);
xmlhttp.send(null);
}
</script>