var base64s = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

function encode(decStr)
{
    decStr = escape(decStr);
    
    var bits;
    var ual
    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 = '';
    
    for (var i = 0; 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) undecOut = decOut.substring(0, decOut.length -2);
    else if (encStr.charCodeAt(i -1) == 61) undecOut = decOut.substring(0, decOut.length -1);
    else undecOut = decOut;
  
    return unescape(undecOut);
}