function getXMLHTTPRequest() {
	try {
		req = new XMLHttpRequest();
	} catch(err1) {
		try {
			req = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (err2) {
			try {
				req = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (err3) {
				req = false;
		}
	}
}
return req;
}
var http = getXMLHTTPRequest();

function getSubCategory() {
	var cat_id=document.getElementById('cat_select').value;
//	alert(cat_id);
//////////////to hide sub cat//////////
	if(cat_id=="all_cat")
		document.getElementById('dis_sub_cat').style.display='none';
	var myurl = "ajax/search_subcategory.php";//alert(myurl);
	myRand = parseInt(Math.random()*999999999999999);
	var modurl = myurl+"?rand="+myRand&+"category_id="+cat_id&
	http.open("GET", modurl, true);
	http.onreadystatechange = useHttpResponse;
	http.send(null);
}
function useHttpResponse() {
	
	if (http.readyState == 4) {
		
		if(http.status == 200) { //
			var mytext = http.responseText;
			//alert(mytext);
			document.getElementById('dis_sub_cat').style.display='none';
			if(navigator.appName=="Microsoft Internet Explorer")
			{
				document.getElementById('dis_sub_cat').innerHTML = "<select name='sub_cat_select' id='sub_cat_select'>"+mytext+"</select>";
				document.getElementById('dis_sub_cat').style.display='';
				//alert(document.getElementById('dis_sub_cat').innerHTML);
			}
			else
			{
				var cat_id=document.getElementById('cat_select').value;
				document.getElementById('sub_cat_select').innerHTML = mytext;
				if(cat_id=="all_cat")
						document.getElementById('dis_sub_cat').style.display='none';
				else
						document.getElementById('dis_sub_cat').style.display='block';
			}
		}
	} else {
			document. getElementById('sub_cat_select').innerHTML = "";
	}
}