function createXMLHttpRequest() {
		var ua;
		if(window.XMLHttpRequest) {
			try {
				ua = new XMLHttpRequest();
			} catch(e) {
				ua = false;
			}
		} else if(window.ActiveXObject) {
			try {
				ua = new ActiveXObject("Microsoft.XMLHTTP");
			} catch(e) {
				ua = false;
			}
		}  
		return ua;
	}
	var req = createXMLHttpRequest();

	function sendRequest(search, start) {
		var url = (start) ? "search.php?search="+search+"&start="+start : "search.php?search="+search;
		req.open('get', url+"&type="+active_tab, true);
		req.onreadystatechange = handleResponse;
		req.send(null);
		return false;
	}
	function handleResponse() {
		if(req.readyState == 4){
			var response = req.responseText;
			document.getElementById("results").innerHTML = response;
			loading_img("png");
			document.getElementById("r1").focus(); //select the first result
			document.getElementById("input").focus();
			//update_ads();
		}
	}