function Reset()
{
    document.getElementById("txtUserName").value    == "";
    document.getElementById("txtPwd").value         == "";
    document.getElementById("txtUserName").select();
}

function CheckUserPwd()
{
    if ( document.getElementById("txtUserName").value == "" )
    {
        alert("Please input the user name.");
        document.getElementById("txtUserName").select();
        return false;
    }
    
    if ( document.getElementById("txtPwd").value == "" )
    {
        alert("Please input the password.");
        document.getElementById("txtPwd").select();
        return false;
    }
    return true;
}

function detectCapsLock(e)
{
    valueCapsLock = e.keyCode ? e.keyCode : e.which; // CapsLock　是否打开
    valueShift = e.shiftKey ? e.shiftKey : ((valueCapsLock == 16) ? true : false); // shift键是否按住

    if (((valueCapsLock >= 65 && valueCapsLock <= 90) && !valueShift) // CapsLock打开，并且shift键没有按住

    || ((valueCapsLock >= 97 && valueCapsLock <= 122) && valueShift)) // CapsLock打开，并且按住shift键

    {
        document.getElementById('capStatus').style.visibility = 'visible';
    }
    else
    {
        document.getElementById('capStatus').style.visibility = 'hidden';
    }
}