function checkForm()
{
    var $ = document.getElementById;
    var sname = $("name");
    if (sname.value.length<1)
    {
        alert("姓名不能为空");
        sname.focus();
        return false;
    }
    var phone = $("phone");
    if (phone.value.length<1)
    {
        alert("请留下联系电话");
        phone.focus();
        return false;
    }
    return true;
}