var keyStr = "ABCDEFGHIJKLMNOP" +"QRSTUVWXYZabcdef" +"ghijklmnopqrstuv" +"wxyz0123456789+/" +"=";
        function encode64(input) 
        {
              input = escape(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);
                 chr1 = chr2 = chr3 = "";
                 enc1 = enc2 = enc3 = 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 =
              var base64test = /[^A-Za-z0-9\+\/\=]/g;
              if (base64test.exec(input)) 
        {
                 alert("There were invalid base64 characters in the input text.\n" +
                       "Valid base64 characters are A-Z, a-z, 0-9, '+', '/', and '='\n" +
                       "Expect errors in decoding.");
              }
              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);
                 }

                 chr1 = chr2 = chr3 = "";
                 enc1 = enc2 = enc3 = enc4 = "";

              } while (i < input.length);
              return unescape(output);
        }
        var url=encode64(window.location);