base64 = new function()
{
    var b64Char   = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    var b64EncTbl = b64Char.split( '' );
    var b64DecTbl = [];
    for( var ix = 0; ix < b64Char.length; ix++ ) {
        b64DecTbl[ b64EncTbl[ ix ] ] = ix;
    }

    this.encode = function( source )
    {
        var pvCh = null, mode = 0, result = "";

        for( var ix = 0; ix < source.length; ix++ ) {
            var ch = source.charCodeAt( ix ) & 0xff;

            mode = ix % 3;

            if( mode == 0 ) {
                result += b64EncTbl[ ( ch >> 2 ) ];

              pvCh = ( ch & 0x03 ) << 4;
            }
            else if( mode == 1 ) {
                result += b64EncTbl[ ( ch >> 4 ) | pvCh ];

                pvCh = ( ch & 0x0f ) << 2;
            }
            else if( mode == 2 ) {
                result += b64EncTbl[ ( ch >> 6 ) | pvCh ];
                result += b64EncTbl[ ( ch & 0x3f ) ];
            }
        }

        if( mode != 2 ) {
            result += b64EncTbl[ pvCh ];
        }

	    if( result.length % 4 > 0 ) {
	        var eqCnt = 4 - result.length % 4;
	        for( var ix = 0; ix < eqCnt; ix++ ) {
	            result += "=";
	        }
	    }

        return result;
    }

    this.decode = function( source )
    {
        var bytedata = 0, mode = 0, result = "";

        for( var ix = 0; ix < source.length; ix++ ) {
            var ch     = source.charAt( ix );

            if( typeof( b64DecTbl[ ch ] ) == 'undefined' ) {
                continue;
            }

            mode = ix % 4;

            if( mode == 0 ) {
                bytedata = b64DecTbl[ ch ] << 2;
            }
            else if( mode == 1 ) {
                result += String.fromCharCode( bytedata | b64DecTbl[ ch ] >> 4 );
                bytedata = ( b64DecTbl[ ch ] & 0x0f ) << 4;
            }
            else if( mode == 2 ) {
                result += String.fromCharCode( bytedata | b64DecTbl[ ch ] >> 2 );
                bytedata = ( b64DecTbl[ ch ] & 0x03 ) << 6;
            }
            else if( mode == 3 ) {
                result += String.fromCharCode( bytedata | b64DecTbl[ ch ] );
                bytedata = 0;
            }
        }

        return result;
    }
}

function encodeURL(str){
    var s0, i, s, u;
    s0 = "";                // encoded str
    for (i = 0; i < str.length; i++){   // scan the source
        s = str.charAt(i);
        u = str.charCodeAt(i);          // get unicode of the char
        if (s == " "){s0 += "+";}       // SP should be converted to "+"
        else {
            if ( u == 0x2a || u == 0x2d || u == 0x2e || u == 0x5f || ((u >= 0x30) && (u <= 0x39)) || ((u >= 0x41) && (u <= 0x5a)) || ((u >= 0x61) && (u <= 0x7a))){       // check for escape
                s0 = s0 + s;            // don't escape
            }
            else {                  // escape
                if ((u >= 0x0) && (u <= 0x7f)){     // single byte format
                    s = "0"+u.toString(16);
                    s0 += "%"+ s.substr(s.length-2);
                }
                else if (u > 0x1fffff){     // quaternary byte format (extended)
                    s0 += "%" + (oxf0 + ((u & 0x1c0000) >> 18)).toString(16);
                    s0 += "%" + (0x80 + ((u & 0x3f000) >> 12)).toString(16);
                    s0 += "%" + (0x80 + ((u & 0xfc0) >> 6)).toString(16);
                    s0 += "%" + (0x80 + (u & 0x3f)).toString(16);
                }
                else if (u > 0x7ff){        // triple byte format
                    s0 += "%" + (0xe0 + ((u & 0xf000) >> 12)).toString(16);
                    s0 += "%" + (0x80 + ((u & 0xfc0) >> 6)).toString(16);
                    s0 += "%" + (0x80 + (u & 0x3f)).toString(16);
                }
                else {                      // double byte format
                    s0 += "%" + (0xc0 + ((u & 0x7c0) >> 6)).toString(16);
                    s0 += "%" + (0x80 + (u & 0x3f)).toString(16);
                }
            }
        }
    }
    return s0;
}

function decodeURL(str){
    var s0, i, j, s, ss, u, n, f;
    s0 = "";                // decoded str
    for (i = 0; i < str.length; i++){   // scan the source str
        s = str.charAt(i);
        if (s == "+"){s0 += " ";}       // "+" should be changed to SP
        else {
            if (s != "%"){s0 += s;}     // add an unescaped char
            else{               // escape sequence decoding
                u = 0;          // unicode of the character
                f = 1;          // escape flag, zero means end of this sequence
                while (true) {
                    ss = "";        // local str to parse as int
                        for (j = 0; j < 2; j++ ) {  // get two maximum hex characters for parse
                            sss = str.charAt(++i);
                            if (((sss >= "0") && (sss <= "9")) || ((sss >= "a") && (sss <= "f"))  || ((sss >= "A") && (sss <= "F"))) {
                                ss += sss;      // if hex, add the hex character
                            } else {--i; break;}    // not a hex char., exit the loop
                        }
                    n = parseInt(ss, 16);           // parse the hex str as byte
                    if (n <= 0x7f){u = n; f = 1;}   // single byte format
                    if ((n >= 0xc0) && (n <= 0xdf)){u = n & 0x1f; f = 2;}   // double byte format
                    if ((n >= 0xe0) && (n <= 0xef)){u = n & 0x0f; f = 3;}   // triple byte format
                    if ((n >= 0xf0) && (n <= 0xf7)){u = n & 0x07; f = 4;}   // quaternary byte format (extended)
                    if ((n >= 0x80) && (n <= 0xbf)){u = (u << 6) + (n & 0x3f); --f;}         // not a first, shift and add 6 lower bits
                    if (f <= 1){break;}         // end of the utf byte sequence
                    if (str.charAt(i + 1) == "%"){ i++ ;}                   // test for the next shift byte
                    else {break;}                   // abnormal, format error
                }
            s0 += String.fromCharCode(u);           // add the escaped character
            }
        }
    }
    return s0;
}