function RequestCate(url,obj) {
        xml_request = false;
        if (window.XMLHttpRequest) { // Mozilla, Safari,...
            xml_request = new XMLHttpRequest();
            if (xml_request.overrideMimeType) {
                xml_request.overrideMimeType('text/xml');
            }
        } else if (window.ActiveXObject) { // IE
            try {
                xml_request = new ActiveXObject("Msxml2.XMLHTTP");
            } catch (e) {
                try {
                    xml_request = new ActiveXObject("Microsoft.XMLHTTP");
                } catch (e) {}
            }
        }
        if (!xml_request) {
            alert('Giving up :( Cannot create an XMLHTTP instance');
            return false;
        }
		url=url;
		xml_request.onreadystatechange = function(){
			   deal(obj)
		};			
		xml_request.open('GET', url+"&sid="+new Date().getTime(),true);
		xml_request.send();
    }

	function deal(obj){
		   if (xml_request.readyState == 4||xml_request.readyState=="complete") {
				if (xml_request.status == 200) {              
						var text = unescape(xml_request.responseText);
						obj.innerHTML=text;
				 }else{
						obj.innerHTML="更新中..."; 
				 }
		   }else{
						obj.innerHTML="更新中"; 
		   }

	}