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, value3, selsubsub) {
	//document.write('CAT IS'+value2+'SUBCAT IS'+value3);
 
		var strURL="tddm_3.php?catid="+value2+"&subcatid="+value3+"&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);
		}
	}