var xmlhttpobj=null; 
function createxmlhttp() { 
 try { 
 xmlhttpobj=new ActiveXObject("Msxml2.XMLHTTP");
 } 
 catch(e) { 
 try { 
 xmlhttpobj=new ActiveXObject("Microsoft.XMLHTTP");
 } 
 catch(oc) { 
 xmlhttpobj=null;
 } 
 } 

 if ( !xmlhttpobj && typeof XMLHttpRequest != "undefined" ) { 
xmlhttpobj=new XMLHttpRequest();
 } 
 return xmlhttpobj;
} 


function text(){
	if(xmlhttpobj.readyState==4){
	document.getElementById("subclass").innerHTML=xmlhttpobj.responseText;//获得返回值;
	}
        else
{
document.getElementById("subclass").innerHTML='正在载入…'
}
}

function getsubcategory(bigclassid){
	if(bigclassid==0){
		document.getElementById("subclass").innerHTML="<select name='smallclassid'><option value='0' selected>选择产品型号</option></select>";
		return;
	};
	
	
	createxmlhttp();
	xmlhttpobj.onreadystatechange=text;
	xmlhttpobj.open('post',"/guest/category/getsubcategory.asp?number="+new Date().getTime(),true);
	xmlhttpobj.setRequestHeader("Content-Type","application/x-www-form-urlencoded;charset=utf-8"); 	xmlhttpobj.send('bigclassid='+escape(bigclassid)); //escape编码，否则会出现乱码
		
}