AJAX script Support

<script language="javascript">

function requestData(id,url) {
req = false;
// branch for native XMLHttpRequest object
if(window.XMLHttpRequest) {
try {
req = new XMLHttpRequest();
} // end try
catch(e) {
req = false;
} // end catch(e)
// branch for IE/Windows ActiveX version
} // end if(window.XMLHttpRequest)
else if(window.ActiveXObject) {
try {
req = new ActiveXObject("Msxml2.XMLHTTP");
} // end try
catch(e) {
try {
req = new ActiveXObject("Microsoft.XMLHTTP");
} // end try
catch(e) {
req = false;
} // end catch(e)
} // end catch(e)
} // end else if(window.ActiveXObject)
if(req) {
req.onreadystatechange = processReqChange;
req.open("GET",url, true);
req.send("");
} // end if(req)

function processReqChange() {
var myLayer;
myLayer = document.getElementById(id);
switch(req.readyState){
case 0: myLayer.innerHTML = "&nbsp;&nbsp; attempting to retrieve data... &nbsp;&nbsp;";
break;
case 1: myLayer.innerHTML = "&nbsp;&nbsp; loading data... &nbsp;&nbsp;";
break;
case 2: myLayer.innerHTML = "&nbsp;&nbsp; loading complete. Preparing data for use &nbsp;&nbsp;";
break;
case 3: myLayer.innerHTML = "&nbsp;&nbsp; data almost done &nbsp;&nbsp;";
break;
case 4: if (req.status == 200) {
// ...processing statements go here...
var response = req.responseText;
myLayer.innerHTML = "&nbsp;&nbsp; successful &nbsp;&nbsp;";
myLayer.innerHTML = response;
} // end if (req.status == 200)
else if(req.status == 404){
myLayer.innerHTML = "";
alert("No resource found:\n" + req.statusText);
}
else {
myLayer.innerHTML = "";
alert("There was a problem retrieving the XML data:\n" + req.statusText);
} // end else
break;
} // end switch(req.readyState)
} // end function processReqChange()

} // end function requestData(id,url)
requestData("Layer1","test.php");
</script>
<div id="Layer1">The retrieved data will be shown here </div>