function isEmpty(value)
{
    return (value == '' || value.length == 0);
}

function isStringLengthBetween(value, min, max)
{
    return (value.length >= min && value.length <= max)
}

function isEmail(value)
{
    return (/^[^ ]+?@[^ ]+?\.[a-z]{2,6}$/i.test(value));
}