var base64s = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

function encode(decStr)
{
 var bits;
 var dual;
 var i = 0;
 var encOut = '';
 while(decStr.length >= i + 3)
 {
  bits = (decStr.charCodeAt(i++) & 0xff) <<16 |
         (decStr.charCodeAt(i++) & 0xff) <<8  |
          decStr.charCodeAt(i++) & 0xff;
  encOut += base64s.charAt((bits & 0x00fc0000) >>18) +
            base64s.charAt((bits & 0x0003f000) >>12) +
            base64s.charAt((bits & 0x00000fc0) >> 6) +
            base64s.charAt((bits & 0x0000003f));
 }
 if(decStr.length -i > 0 && decStr.length -i < 3)
 {
  dual = Boolean(decStr.length -i -1);
  bits = ((decStr.charCodeAt(i++) & 0xff) <<16) |
         (dual ? (decStr.charCodeAt(i) & 0xff) <<8 : 0);
  encOut += base64s.charAt((bits & 0x00fc0000) >>18) +
            base64s.charAt((bits & 0x0003f000) >>12) +
            (dual ? base64s.charAt((bits & 0x00000fc0)             >>6) : '=') +
            '=';
 }
 return(encOut);
}

function decode(encStr)
{
 var bits;
 var decOut = '';
 var i = 0;
 for(; i<encStr.length; i += 4)
 {
  bits = (base64s.indexOf(encStr.charAt(i))    & 0xff) <<18 |
         (base64s.indexOf(encStr.charAt(i +1)) & 0xff) <<12 |
         (base64s.indexOf(encStr.charAt(i +2)) & 0xff) << 6 |
          base64s.indexOf(encStr.charAt(i +3)) & 0xff;
  decOut += String.fromCharCode((bits & 0xff0000) >>16, (bits & 0xff00) >>8, bits & 0xff);
 }
 if(encStr.charCodeAt(i -2) == 61)
 {
  return(decOut.substring(0, decOut.length -2));
 }
 else if(encStr.charCodeAt(i -1) == 61)
 {
  return(decOut.substring(0, decOut.length -1));
 }
 else {return(decOut)};
}