function user_login(serv) {
    var obj = showModalDialog(serv + "pop_login.aspx?Rnd=" + Math.random(), 'login', 'dialogWidth:380px;dialogHeight:300px;help:0;status:0;resizeable:1');
    //alert(obj);
    if (typeof (obj) == "undefined") return false;
    if (obj==null) return false;
    
    //alert(obj);
    
    return obj;
    
    //obj=2:转入注册页面
    //if (obj == "2") {
    
    //}
    //window.location.href = document.URL;
}