function createxmlhttp( ){
    var xmlhttpobj = false;
    try{
        if( window.ActiveXObject ){
            for( var i = 5; i; i-- ){
                try{
                    if( i == 2 ){
xmlhttpobj = new ActiveXObject( "Microsoft.XMLHTTP" );    
                    }else{
xmlhttpobj = new ActiveXObject( "Msxml2.XMLHTTP." + i + ".0" );    
xmlhttpobj.setRequestHeader("Content-Type","text/xml");
xmlhttpobj.setRequestHeader("Content-Type","gb2312");
                 }
break;}
                catch(e){                        
                    xmlhttpobj = false;
                }
            }
        }else if( window.XMLHttpRequest ){
            xmlhttpobj = new XMLHttpRequest();
            if (xmlhttpobj.overrideMimeType) {
                xmlhttpobj.overrideMimeType('text/xml');
            }
        }
    }catch(e){
        xmlhttpobj = false;
    }


    return xmlhttpobj ;
}


function getsubcategory(bigclassid){
	if(bigclassid==0){
		document.getElementById("subclass").innerHTML="<select name='smallclassid' class='pro_search_input'><option value='0' selected>Select product</option></select>";
		return;
	};
	var xmlhttpobj = createxmlhttp();
	if(xmlhttpobj){
		xmlhttpobj.open('get',"getsubcategory.asp?bigclassid="+bigclassid+"&number="+Math.random(),false);
		xmlhttpobj.send(null);
		var html = xmlhttpobj.responseText;
					document.getElementById("subclass").innerHTML=html;
		xmlhttpobj.onreadystatechange=function(){
			if(xmlhttpobj.readystate==4){
				if(xmlhttpobj.status==200){
					//alert('ok');
					var html = xmlhttpobj.responseText;
					document.getElementById("subclass").innerHTML=html;
				}else{
					document.getElementById("subclass").innerHTML="sorry...";
				}
			}else{
				document.getElementById("subclass").innerHTML="wait";
			}
		}	
	}
}