var unicode_escape_maps = {
  'windows-1255': {
    0x20AC:'80', //EURO SIGN
    0x201A:'82', //SINGLE LOW-9 QUOTATION MARK
    0x0192:'83', //LATIN SMALL LETTER F WITH HOOK
    0x201E:'84', //DOUBLE LOW-9 QUOTATION MARK
    0x2026:'85', //HORIZONTAL ELLIPSIS
    0x2020:'86', //DAGGER
    0x2021:'87', //DOUBLE DAGGER
    0x02C6:'88', //MODIFIER LETTER CIRCUMFLEX ACCENT
    0x2030:'89', //PER MILLE SIGN
    0x2039:'8B', //SINGLE LEFT-POINTING ANGLE QUOTATION MARK
    0x2018:'91', //LEFT SINGLE QUOTATION MARK
    0x2019:'92', //RIGHT SINGLE QUOTATION MARK
    0x201C:'93', //LEFT DOUBLE QUOTATION MARK
    0x201D:'94', //RIGHT DOUBLE QUOTATION MARK
    0x2022:'95', //BULLET
    0x2013:'96', //EN DASH
    0x2014:'97', //EM DASH
    0x02DC:'98', //SMALL TILDE
    0x2122:'99', //TRADE MARK SIGN
    0x203A:'9B', //SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
    0x20AA:'A4', //NEW SHEQEL SIGN
    0x00D7:'AA', //MULTIPLICATION SIGN
    0x00F7:'BA', //DIVISION SIGN
    0x05B0:'C0', //HEBREW POINT SHEVA
    0x05B1:'C1', //HEBREW POINT HATAF SEGOL
    0x05B2:'C2', //HEBREW POINT HATAF PATAH
    0x05B3:'C3', //HEBREW POINT HATAF QAMATS
    0x05B4:'C4', //HEBREW POINT HIRIQ
    0x05B5:'C5', //HEBREW POINT TSERE
    0x05B6:'C6', //HEBREW POINT SEGOL
    0x05B7:'C7', //HEBREW POINT PATAH
    0x05B8:'C8', //HEBREW POINT QAMATS
    0x05B9:'C9', //HEBREW POINT HOLAM
    0x05BB:'CB', //HEBREW POINT QUBUTS
    0x05BC:'CC', //HEBREW POINT DAGESH OR MAPIQ
    0x05BD:'CD', //HEBREW POINT METEG
    0x05BE:'CE', //HEBREW PUNCTUATION MAQAF
    0x05BF:'CF', //HEBREW POINT RAFE
    0x05C0:'D0', //HEBREW PUNCTUATION PASEQ
    0x05C1:'D1', //HEBREW POINT SHIN DOT
    0x05C2:'D2', //HEBREW POINT SIN DOT
    0x05C3:'D3', //HEBREW PUNCTUATION SOF PASUQ
    0x05F0:'D4', //HEBREW LIGATURE YIDDISH DOUBLE VAV
    0x05F1:'D5', //HEBREW LIGATURE YIDDISH VAV YOD
    0x05F2:'D6', //HEBREW LIGATURE YIDDISH DOUBLE YOD
    0x05F3:'D7', //HEBREW PUNCTUATION GERESH
    0x05F4:'D8', //HEBREW PUNCTUATION GERSHAYIM
    0x05D0:'E0', //HEBREW LETTER ALEF
    0x05D1:'E1', //HEBREW LETTER BET
    0x05D2:'E2', //HEBREW LETTER GIMEL
    0x05D3:'E3', //HEBREW LETTER DALET
    0x05D4:'E4', //HEBREW LETTER HE
    0x05D5:'E5', //HEBREW LETTER VAV
    0x05D6:'E6', //HEBREW LETTER ZAYIN
    0x05D7:'E7', //HEBREW LETTER HET
    0x05D8:'E8', //HEBREW LETTER TET
    0x05D9:'E9', //HEBREW LETTER YOD
    0x05DA:'EA', //HEBREW LETTER FINAL KAF
    0x05DB:'EB', //HEBREW LETTER KAF
    0x05DC:'EC', //HEBREW LETTER LAMED
    0x05DD:'ED', //HEBREW LETTER FINAL MEM
    0x05DE:'EE', //HEBREW LETTER MEM
    0x05DF:'EF', //HEBREW LETTER FINAL NUN
    0x05E0:'F0', //HEBREW LETTER NUN
    0x05E1:'F1', //HEBREW LETTER SAMEKH
    0x05E2:'F2', //HEBREW LETTER AYIN
    0x05E3:'F3', //HEBREW LETTER FINAL PE
    0x05E4:'F4', //HEBREW LETTER PE
    0x05E5:'F5', //HEBREW LETTER FINAL TSADI
    0x05E6:'F6', //HEBREW LETTER TSADI
    0x05E7:'F7', //HEBREW LETTER QOF
    0x05E8:'F8', //HEBREW LETTER RESH
    0x05E9:'F9', //HEBREW LETTER SHIN
    0x05EA:'FA', //HEBREW LETTER TAV
    0x200E:'FD', //LEFT-TO-RIGHT MARK
    0x200F:'FE'  //RIGHT-TO-LEFT MARK
  }
};

var charset_re = new RegExp('.*charset\s*=\s*([a-z0-9-]+)', 'i');


function unicode_escape(str, charset) {
    if (typeof(charset) == 'undefined') {
        var content = $("meta").attr("content");
        var charset = content.replace(charset_re, '$1');
        charset = charset.toLowerCase();
    }
    var result = '';
    if (charset in unicode_escape_maps) {
        var code = 0, c = 0;
        for (c = 0; c < str.length; ++c) {
            code = str.charCodeAt(c);
            if (code in unicode_escape_maps[charset]) {
                result += '%' + unicode_escape_maps[charset][code];
            }
            else {
                result += escape(str.substr(c, 1));
            }
        }
    }
    else {
        result = encodeURIComponent(str);
    }
    return result;
}