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function GetCardType(number) {
    var re = new RegExp("^4");
    if (number.match(re) != null)
        return "VISA";

    re = new RegExp("^(34|37)");
    if (number.match(re) != null)
        return "AMEX";

    re = new RegExp("^5[1-5]");
    if (number.match(re) != null)
        return "MC";

    re = new RegExp("^6011");
    if (number.match(re) != null)
        return "DISCOVER";

    return "";
}