function GetXmlHttpObject() {
  var xmlHttp=null;
  try{
    // Firefox, Opera 8.0+, Safari
    xmlHttp=new XMLHttpRequest();
  }
  catch (e){
    //Internet Explorer
    try {
      xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch (e){
      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
  }
  return xmlHttp;
}

function get2(value1, selsub) {
		var strURL="tddm_2.php?catid="+value1+"&selsub="+selsub;
		var req = GetXmlHttpObject();

		if(req){
			req.onreadystatechange = function() {
				if (req.readyState == 4 || req.readyState == "complete") {
					document.getElementById('option2').innerHTML=req.responseText;
				}
			}
			req.open("GET", strURL, true);
			req.send(null);
		}
	}

	function get3(value2, selsubsub) {
		var strURL="tddm_3.php?subcatid="+value2+"&selsubsub="+selsubsub;
		var req = GetXmlHttpObject();

		if(req){
			req.onreadystatechange = function() {
				if (req.readyState == 4 || req.readyState == "complete") {
					document.getElementById('option3').innerHTML=req.responseText;
				}
			}
			req.open("GET", strURL, true);
			req.send(null);
		}
	}

function aj_cities(value1, sel){
  var strURL="aj_cities.php?provid="+value1+"&sel="+sel;
	var req = GetXmlHttpObject();

	if (req){
		req.onreadystatechange = function(){
			if (req.readyState == 4 || req.readyState == "complete") {
        document.getElementById('city').innerHTML=req.responseText;
			}
		}
		req.open("GET", strURL, true);
		req.send(null);
	}
}