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);
   output = unescape( output );
   return output;
}
/*
function UrlEncode( str )
{
	var ret = "";
	var strSpecial = "!\"#$%&'()*+,/:;<=>?[]^`{|}~%";
	for( i = 0; i < str.length; i ++ )
	{
		var chr = str.charAt( i );
		var c = str2asc(chr);
		if( parseInt( "0x" + c ) > 0x7f )
		{
			ret += "%" + c.slice( 0, 2 ) + "%" + c.slice( -2 );
		}
		else
		{
			/*if( chr == ' ' )
			{
				ret += "+";
			}
			else if( strSpecial.indexOf( chr ) != -1 )
			{
				ret += "%" + c.toString( 16 );
			}
			else
			{
				ret += chr;
			}
		}
	}
	return ret;
}
*/
/*function UrlDecode(str)
{ 
	var ret=""; 
	for( var i=0; i<str.length; i++ )
	{
		var chr = str.charAt(i); 
		if(chr == "+")
		{ 
			ret+=" ";
		}
		else if( chr=="%" )
		{
			var asc = str.substring(i+1,i+3);
			if( parseInt( "0x" + asc) > 0x7f )
			{
				ret += asc2str( parseInt( "0x" + asc + str.substring( i+4, i+6 ) ) );
				i += 5;
			}
			else
			{
				ret += asc2str( parseInt( "0x" + asc ) );
				i += 2;
			}
		}
		else
		{
			ret += chr;
		}
	} 
	return ret;
} */