var sPage = "/includes/tasks.asp";
AJAXRequest(sPage, "GET", "ajax=1", function(sResponse, aError){
	if(aError){
		if(aError[0] == AJAX_ERROR_NOSUPPORT){
			if(document.images){
				var objImage = new Image();
				objImage.src = sPage + "?n=" + Math.round(Math.random() * 1000);
			}
		}
	}
}, false);