function Inint_AJAX() {
	try { return new ActiveXObject("Msxml2.XMLHTTP"); } catch(e) {} //IE
	try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch(e) {} //IE
	try { return new XMLHttpRequest(); } catch(e) {} //Native Javascript
	alert("XMLHttpRequest not supported");
	return null;
};

function changeHiway(city_id, mt_url) {
	var req = Inint_AJAX();
	req.onreadystatechange = function () {
		if (req.readyState==4) {
			if (req.status==200) {
				//alert(val);
				var regText = req.responseText;
				//alert('regText - '+regText);
				document.getElementById('change_hiway').innerHTML=regText; //return value
				//alert('1 - '+document.getElementById('check_city').innerHTML);
				//alert('2 - '+document.getElementById('city_name').value);
				//document.getElementById('check_hiway').innerHTML=document.getElementById('hiway_name').value;
				//changeMetro(document.getElementById('city').value, mt_url)
			}
		}
	};
	req.open("GET", "/ajax/change_hiway.php?city_id="+city_id+mt_url);
	req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8"); // set Header
	req.send(null); //send value
	return false;
}
//window.onLoad=dochange(336, 345); // value in first dropdown