<script language="javascript" runat="server">  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);  }  </script>