var base64 =
{
	_keyStr : 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=',

	encode : function ( input )
	{
		var output = '';
		var i      = 0;
		var chr1;
		var chr2;
		var chr3;
		var enc1;
		var enc2;
		var enc3;
		var enc4;
		

		input = this._utf8_encode( input );

		while( i < input.length )
		{
			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 += this._keyStr.charAt( enc1 );
			output += this._keyStr.charAt( enc2 );
			output += this._keyStr.charAt( enc3 );
			output += this._keyStr.charAt( enc4 );
		}

		return output;
	},

	decode : function ( input )
	{
		var output = '';
		var i      = 0;
		var chr1;
		var chr2;
		var chr3;
		var enc1;
		var enc2;
		var enc3;
		var enc4;

		input = input.replace( /[^A-Za-z0-9\+\/\=]/g, "" );

		while( i < input.length )
		{
			enc1 = this._keyStr.indexOf( input.charAt( i++ ) );
			enc2 = this._keyStr.indexOf( input.charAt( i++ ) );
			enc3 = this._keyStr.indexOf( input.charAt( i++ ) );
			enc4 = this._keyStr.indexOf( input.charAt( i++ ) );

			chr1 = ( enc1 << 2 ) | ( enc2 >> 4 );
			chr2 = ( ( enc2 & 15 ) << 4 ) | ( enc3 >> 2 );
			chr3 = ( ( enc3 & 3  ) << 6 ) | enc4;

			output += String.fromCharCode( chr1 );

			if( enc3 != 64 )
			{
				output += String.fromCharCode( chr2 );
			}
			
			if( enc4 != 64 )
			{
				output += String.fromCharCode( chr3 );
			}
		}

		output = this._utf8_decode( output );

		return output;

	},

	_utf8_encode : function ( string )
	{
		string      = string.replace( /\r\n/g, "\n" );
		var utftext = '';

		for( var i = 0; i < string.length; i ++ )
		{
			var c = string.charCodeAt( i );

			if( c < 128 )
			{
				utftext += String.fromCharCode( c );
			}
			else if( ( c > 127 ) && ( c < 2048 ) )
			{
				utftext += String.fromCharCode( ( c >> 6 ) | 192 );
				utftext += String.fromCharCode( ( c & 63 ) | 128 );
			}
			else
			{
				utftext += String.fromCharCode( ( c >> 12 ) | 224 );
				utftext += String.fromCharCode( ( ( c >> 6 ) & 63 ) | 128 );
				utftext += String.fromCharCode( ( c & 63 ) | 128 );
			}
		}

		return utftext;
	},

	_utf8_decode : function ( utftext )
	{
		var string = '';
		var i      = 0;
		var c      = 0;
		var c1     = 0;
		var c2     = 0;

		while ( i < utftext.length )
		{
			c = utftext.charCodeAt( i );

			if( c < 128 )
			{
				string += String.fromCharCode( c );
				i ++;
			}
			else if( ( c > 191 ) && ( c < 224 ) )
			{
				c2      = utftext.charCodeAt( i + 1 );
				string += String.fromCharCode( ( ( c & 31 ) << 6 ) | ( c2 & 63 ) );
				i      += 2;
			}
			else
			{
				c2      = utftext.charCodeAt( i + 1 );
				c3      = utftext.charCodeAt( i + 2 );
				string += String.fromCharCode( ( ( c & 15 ) << 12 ) | ( ( c2 & 63 ) << 6 ) | ( c3 & 63 ) );
				i      += 3;
			}
		}

		return string;
	}
}