/**
*
*  Base64 encode / decode
*  http://www.webtoolkit.info/
*
**/
var Base64 = 
{

	// private property
	_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
	
	// public method for encoding
	encode : function(input)
	{
		var output = "";
		var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
		var i = 0;
		
		input = Base64._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 = output +
			this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
			this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
		}
		return output;
	},
	
	
	// public method for decoding
	decode : function(input)
	{
		var output = "";
		var chr1, chr2, chr3;
		var enc1, enc2, enc3, enc4;
		var i = 0;
		
		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 = output + String.fromCharCode(chr1);
			
			if(enc3 != 64)
				output = output + String.fromCharCode(chr2);
			if (enc4 != 64)
				output = output + String.fromCharCode(chr3);
		}
		
		output = Base64._utf8_decode(output);
		
		return output;
	},
	
	
	// private method for UTF-8 encoding
	_utf8_encode : function(string)
	{
		string = string.replace(/\r\n/g,"\n");
		var utftext = "";
		
		for(var n = 0; n < string.length; n++)
		{
			var c = string.charCodeAt(n);
			
			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;
	},
	
	
	// private method for UTF-8 decoding
	_utf8_decode : function(utftext)
	{
		var string = "";
		var i = 0;
		var c = c1 = 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;
	}
}