function ajax_load(url,id,eval_str){
    if(document.getElementById){var x=(window.ActiveXObject)?new ActiveXObject("Microsoft.XMLHTTP"):new XMLHttpRequest();}
    if(x){x.onreadystatechange=function() {
        el=document.getElementById(id); 
        el.innerHTML='<center><img border="0" src="http://top9x.us/img/loader.gif"> Đang tải...</center>';
        if(x.readyState==4&&x.status==200){
            el.innerHTML=''; 
            el=document.getElementById(id);
            el.innerHTML=x.responseText; 
            eval(eval_str);
            }
        }
    x.open("GET",url,true);x.send(null);
    }
}