function ajaxRequest(url, responseHandler){
    var xmlHttp;
    try {
	xmlHttp=new XMLHttpRequest();
    } catch (e){
	try {
	   xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
	} catch (e){
	   try {
	      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
	   } catch (e){
	      alert("Your browser does not support AJAX!");
	      return false;
	   }
	}
    }
	      
    xmlHttp.onreadystatechange=function(){				
       if(xmlHttp.readyState==4){
           responseHandler(xmlHttp.responseText);
       }
    }
    
    xmlHttp.open("GET", url, true);
    xmlHttp.send(null);
    return true;
}