function tijiao()
{
    if(event.keyCode==13)
    {
        document.getElementById("login_a").click();
    }
}

function checkForm()
{
    var userName = document.getElementById("userName").value;
    var password = document.getElementById("password").value;
    if(userName == "")
    {
        alert("请输入用户名！");
    }
    else if(password == "")
    {
        alert("请输入密码！");
    }
    else
    {
        $.get("ajax/checkLogin.aspx",{type:'login',account:userName,password:password,r:Math.random()},function(date){if(date == '1'){location = location}else if(date == '0'){alert('用户名或密码错误！')}else{alert(date)}})
    }
}