// initialize XMLHttpRequest object
var xmlobj=null;
var data=new Array();
// send http request
function sendRequest(doc,handler){
    // check for existing requests
    if(xmlobj!=null&&xmlobj.readyState!=0&&xmlobj.readyState!=4){
        xmlobj.abort();
    }
    try{
        // instantiate object for Mozilla, Nestcape, etc.
        xmlobj=new XMLHttpRequest();
    }
    catch(e){
        try{
            // instantiate object for Internet Explorer
            xmlobj=new ActiveXObject('Microsoft.XMLHTTP');
        }
        catch(e){
            // Ajax is not supported by the browser
            xmlobj=null;
            return false;
        }
    }
    // assign state handler

		xmlobj.onreadystatechange=eval(handler);
		
		// open socket connection
		
    xmlobj.open('GET',doc,true);
		
		// send GET request
    xmlobj.send(null);
}