var HexDecode = {
    
    _hexv: {
        "00": 0, "01": 1, "02": 2, "03": 3, "04": 4, "05": 5, "06": 6, "07": 7, "08": 8, "09": 9, "0A": 10, "0B": 11, "0C": 12, "0D": 13, "0E": 14, "0F": 15,
        "10": 16, "11": 17, "12": 18, "13": 19, "14": 20, "15": 21, "16": 22, "17": 23, "18": 24, "19": 25, "1A": 26, "1B": 27, "1C": 28, "1D": 29, "1E": 30, "1F": 31,
        "20": 32, "21": 33, "22": 34, "23": 35, "24": 36, "25": 37, "26": 38, "27": 39, "28": 40, "29": 41, "2A": 42, "2B": 43, "2C": 44, "2D": 45, "2E": 46, "2F": 47,
        "30": 48, "31": 49, "32": 50, "33": 51, "34": 52, "35": 53, "36": 54, "37": 55, "38": 56, "39": 57, "3A": 58, "3B": 59, "3C": 60, "3D": 61, "3E": 62, "3F": 63,
        "40": 64, "41": 65, "42": 66, "43": 67, "44": 68, "45": 69, "46": 70, "47": 71, "48": 72, "49": 73, "4A": 74, "4B": 75, "4C": 76, "4D": 77, "4E": 78, "4F": 79,
        "50": 80, "51": 81, "52": 82, "53": 83, "54": 84, "55": 85, "56": 86, "57": 87, "58": 88, "59": 89, "5A": 90, "5B": 91, "5C": 92, "5D": 93, "5E": 94, "5F": 95,
        "60": 96, "61": 97, "62": 98, "63": 99, "64": 100, "65": 101, "66": 102, "67": 103, "68": 104, "69": 105, "6A": 106, "6B": 107, "6C": 108, "6D": 109, "6E": 110, "6F": 111,
        "70": 112, "71": 113, "72": 114, "73": 115, "74": 116, "75": 117, "76": 118, "77": 119, "78": 120, "79": 121, "7A": 122, "7B": 123, "7C": 124, "7D": 125, "7E": 126, "7F": 127,
        "80": 128, "81": 129, "82": 130, "83": 131, "84": 132, "85": 133, "86": 134, "87": 135, "88": 136, "89": 137, "8A": 138, "8B": 139, "8C": 140, "8D": 141, "8E": 142, "8F": 143,
        "90": 144, "91": 145, "92": 146, "93": 147, "94": 148, "95": 149, "96": 150, "97": 151, "98": 152, "99": 153, "9A": 154, "9B": 155, "9C": 156, "9D": 157, "9E": 158, "9F": 159,
        "A0": 160, "A1": 161, "A2": 162, "A3": 163, "A4": 164, "A5": 165, "A6": 166, "A7": 167, "A8": 168, "A9": 169, "AA": 170, "AB": 171, "AC": 172, "AD": 173, "AE": 174, "AF": 175,
        "B0": 176, "B1": 177, "B2": 178, "B3": 179, "B4": 180, "B5": 181, "B6": 182, "B7": 183, "B8": 184, "B9": 185, "BA": 186, "BB": 187, "BC": 188, "BD": 189, "BE": 190, "BF": 191,
        "C0": 192, "C1": 193, "C2": 194, "C3": 195, "C4": 196, "C5": 197, "C6": 198, "C7": 199, "C8": 200, "C9": 201, "CA": 202, "CB": 203, "CC": 204, "CD": 205, "CE": 206, "CF": 207,
        "D0": 208, "D1": 209, "D2": 210, "D3": 211, "D4": 212, "D5": 213, "D6": 214, "D7": 215, "D8": 216, "D9": 217, "DA": 218, "DB": 219, "DC": 220, "DD": 221, "DE": 222, "DF": 223,
        "E0": 224, "E1": 225, "E2": 226, "E3": 227, "E4": 228, "E5": 229, "E6": 230, "E7": 231, "E8": 232, "E9": 233, "EA": 234, "EB": 235, "EC": 236, "ED": 237, "EE": 238, "EF": 239,
        "F0": 240, "F1": 241, "F2": 242, "F3": 243, "F4": 244, "F5": 245, "F6": 246, "F7": 247, "F8": 248, "F9": 249, "FA": 250, "FB": 251, "FC": 252, "FD": 253, "FE": 254, "FF": 255
    },
    
    _ntos: function(n) {
        n = n.toString(16);
        if (n.length == 1) n = "0" + n;
        n = "%" + n;
        return unescape(n);
    },

    decode: function(str) {
        str = str.toUpperCase().replace(new RegExp("s/[^0-9A-Z]//g"));
        var result = "";
        var nextchar = "";
        for (var i = 0; i < str.length; i++) {
            nextchar += str.charAt(i);
            if (nextchar.length == 2) {
                result += HexDecode._ntos(HexDecode._hexv[nextchar]);
                nextchar = "";
            }
        }
        return result;
    }
}