/** Base64 encode / decode - http://www.webtoolkit.info/  **/
var Base64 = {
	_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
	Encode : function (input) {
		///<summary>Base64-encodes a string</summary>
		///<param name="input" type="String">The text to encode</input>
		///<returns type="String">Returns the encoded text</returns>
		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;
	},
	Decode : function (input) {
		///<summary>Decodes a Base64-encoded string</summary>
		///<param name="input" type="String">The encoded text</input>
		///<returns type="String">Returns the plain text</returns>
		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;
	},
	_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;
	},
	_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;
	}
}