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// This code was written by Tyler Akins and has been placed in the

// public domain.  It would be nice if you left this header intact.

// Base64 code from Tyler Akins -- http://rumkin.com

var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

function encode64(input) {

   var output = "";

   var chr1, chr2, chr3;

   var enc1, enc2, enc3, enc4;

   var i = 0;

   do {

      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 + keyStr.charAt(enc1) + keyStr.charAt(enc2) +

         keyStr.charAt(enc3) + keyStr.charAt(enc4);

   } while (i < input.length);

   return output;

}

function decode64(input) {

   var output = "";

   var chr1, chr2, chr3;

   var enc1, enc2, enc3, enc4;

   var i = 0;

   // remove all characters that are not A-Z, a-z, 0-9, +, /, or =

   input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

   do {

      enc1 = keyStr.indexOf(input.charAt(i++));

      enc2 = keyStr.indexOf(input.charAt(i++));

      enc3 = keyStr.indexOf(input.charAt(i++));

      enc4 = 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);

      }

   } while (i < input.length);

   return output;

}