function $(id)
{
    return document.getElementById(id);
}
//切换登陆框
function LoginSwitch(type)
{
    document.getElementById("a1").className = (type == 1 ? "aa1" : "aa2");
    document.getElementById("a2").className = (type == 1 ? "aa2" : "aa1");
    document.getElementById("alist1").className = (type == 1 ? "box_show" : "box_none");
    document.getElementById("alist2").className = (type == 1 ? "box_none" : "box_show");
}