function loginFormSubmit()
{
    var f = document.f;
    if (f.j_username.value != "" && f.j_password.value != "")
        f.submit();
    else
        alert("login id and password are required");
}

function loginFormReset() {
    document.forms[0].reset();
}

function checkKeyCode(event)
{
    if (event.keyCode == 13) // enter
        loginFormSubmit();
}