function validateNonEmpty(field)
{
    return field.value.length > 0;
}

function validateEmail(field)
{
    with (field)
    {
        apos = value.indexOf("@");
        dotpos=value.lastIndexOf(".");
        if (apos < 1|| dotpos-apos < 2)
            return false;
        return true;
    }
}