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);     
    }