var xhttpHandshake;
		window.setInterval("handshake()", 60000);
		function handshake(){
			xhttpHandshake=newXmlHttp();
			xhttpHandshake.onreadystatechange = processReqChange;
			if(xhttpHandshake){
				var d=new Date();
				var url="/lab/handshake.html?d="+d;
				xhttpHandshake.open("GET",url,true);
				xhttpHandshake.send(null);
			}
		}

		function processReqChange() {
		    if (xhttpHandshake.readyState == 4) {
				//alert(xhttpHandshake.responseText);
		    }
		}