text: ﻿/**
  *
  *  Base64 encode / decode
  *  http://www.webtoolkit.info/
  *
  **/
  
  var Base64 = {
  
      // private property
      _keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
  
      // public method for encoding
      encode: function(input) {
          var output = "";
          var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
          var i = 0;
  
          input = Base64._utf8_encode(input);
  
          while (i < input.length) {
  
              chr1 = input.charCodeAt(i++);
              chr2 = input.charCodeAt(i++);
              chr3 = input.charCodeAt(i++);
  
              enc1 = chr1 >> 2;
              enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
              enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
              enc4 = chr3 & 63;
  
              if (isNaN(chr2)) {
                  enc3 = enc4 = 64;
              } else if (isNaN(chr3)) {
                  enc4 = 64;
              }
  
              output = output +
  			this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
  			this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
  
          }
  
          return output;
      },
  
      // public method for decoding
      decode: function(input) {
          var output = "";
          var chr1, chr2, chr3;
          var enc1, enc2, enc3, enc4;
          var i = 0;
  
          input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
  
          while (i < input.length) {
  
              enc1 = this._keyStr.indexOf(input.charAt(i++));
              enc2 = this._keyStr.indexOf(input.charAt(i++));
              enc3 = this._keyStr.indexOf(input.charAt(i++));
              enc4 = this._keyStr.indexOf(input.charAt(i++));
  
              chr1 = (enc1 << 2) | (enc2 >> 4);
              chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
              chr3 = ((enc3 & 3) << 6) | enc4;
  
              output = output + String.fromCharCode(chr1);
  
              if (enc3 != 64) {
                  output = output + String.fromCharCode(chr2);
              }
              if (enc4 != 64) {
                  output = output + String.fromCharCode(chr3);
              }
  
          }
  
          output = Base64._utf8_decode(output);
  
          return output;
  
      },
  
      // private method for UTF-8 encoding
      _utf8_encode: function(string) {
          string = string.replace(/\r\n/g, "\n");
          var utftext = "";
  
          for (var n = 0; n < string.length; n++) {
  
              var c = string.charCodeAt(n);
  
              if (c < 128) {
                  utftext += String.fromCharCode(c);
              }
              else if ((c > 127) && (c < 2048)) {
                  utftext += String.fromCharCode((c >> 6) | 192);
                  utftext += String.fromCharCode((c & 63) | 128);
              }
              else {
                  utftext += String.fromCharCode((c >> 12) | 224);
                  utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                  utftext += String.fromCharCode((c & 63) | 128);
              }
  
          }
  
          return utftext;
      },
  
      // private method for UTF-8 decoding
      _utf8_decode: function(utftext) {
          var string = "";
          var i = 0;
          var c = c1 = c2 = 0;
  
          while (i < utftext.length) {
  
              c = utftext.charCodeAt(i);
  
              if (c < 128) {
                  string += String.fromCharCode(c);
                  i++;
              }
              else if ((c > 191) && (c < 224)) {
                  c2 = utftext.charCodeAt(i + 1);
                  string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                  i += 2;
              }
              else {
                  c2 = utftext.charCodeAt(i + 1);
                  c3 = utftext.charCodeAt(i + 2);
                  string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                  i += 3;
              }
  
          }
  
          return string;
      }
  
  };