// Customise those settings

var divid = "response";
var url = "boo.php";


////////////////////////////////
//
// Setting DIV innerHTML
//
////////////////////////////////


function setContent(operation,elementid){

// The XMLHttpRequest object

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("Your browser does not support AJAX.");
return false;
}
}
}

// Timestamp for preventing IE caching the GET request

fetch_unix_timestamp = function()
{
return parseInt(new Date().getTime().toString().substring(0, 10))
}

var timestamp = fetch_unix_timestamp();
var nocacheurl = url+"?t="+timestamp;

// The code...

xmlHttp.onreadystatechange=function(){
if(xmlHttp.readyState!=4){
document.getElementById(divid).innerHTML='Processing...';
}
if(xmlHttp.readyState==4){
document.getElementById(divid).innerHTML=xmlHttp.responseText;
}
}
xmlHttp.open("GET",nocacheurl+"&operation="+operation+"&elementid="+elementid,true);
xmlHttp.send(null);
}