window.Base64 = (function(){
	var Base64={};
	var keyStr = "ABCDEFGHIJKLMNOP" + "QRSTUVWXYZabcdef" + "ghijklmnopqrstuv" + "wxyz0123456789+/" + "=";

	Base64.encode64 = function (input) {
	    input = unicodetoBytes(input);
	    var output = "";
	    var chr1, chr2, chr3 = "";
	    var enc1, enc2, enc3, enc4 = "";
	    var i = 0;

	    do {
	        chr1 = input[i++];
	        chr2 = input[i++];
	        chr3 = input[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;
	}

	Base64.decode64 = function (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, "");
	    output = new Array();
	    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.push(chr1);
	        if (enc3 != 64) {
	            output.push(chr2);
	        }
	        if (enc4 != 64) {
	            output.push(chr3);
	        }

	        chr1 = chr2 = chr3 = "";
	        enc1 = enc2 = enc3 = enc4 = "";

	    } while (i < input.length);
	    return bytesToUnicode(output);
	}

	function unicodetoBytes(s) {
	    var result = new Array();
	    if (s == null || s == "") return result;
	    result.push(255); // add "FE" to head
	    result.push(254);
	    for (var i = 0; i < s.length; i++) {
	        var c = s.charCodeAt(i).toString(16);
	        if (c.length == 1) i = "000" + c;
	        else if (c.length == 2) c = "00" + c;
	        else if (c.length == 3) c = "0" + c;
	        var var1 = parseInt(c.substring(2), 16);
	        var var2 = parseInt(c.substring(0, 2), 16);
	        result.push(var1);
	        result.push(var2);
	    }
	    return result;
	}

	function bytesToUnicode(bs) {
	    var result = "";
	    var offset = 0;
	    if (bs.length >= 2 && bs[0] == 255 && bs[1] == 254) offset = 2; // delete
	    // "FE"
	    for (var i = offset; i < bs.length; i += 2) {
	        var code = bs[i] + (bs[i + 1] << 8);
	        result += String.fromCharCode(code);
	    }
	    return result;
	}
	return Base64;
})();