function keyPressLogin(evt)
{
    var theEvent = window.event || arguments.callee.caller.arguments[0];
    if (theEvent) {
        if (theEvent.keyCode == 13) {
            enter();
        }
    }
}

function enter()
{
    var userName = document.getElementById("userName").value;
    var password = document.getElementById("password").value;
    var code = document.getElementById("code").value;
    var screenName = "full_screen" + window.location.hostname;
    if (userName.length > 0 && password.length > 0 && code.length > 0) {
        document.loginForm.submit();
    }
    else {
        alert("请输入企业代码,用户名,密码");
        document.getElementById("code").focus();
    }
}