var Base64 = {

	    _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
    	
	    // public static string encode
	    encode : function (input) {
		    var output = "";
		    var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
		    var i = 0;

		    input = 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 static string decode
	    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 = UTF8.decode(output);

		    return output;

	    }
   }

   var UTF8 = {
        
        // public static string encode
	    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;
	    },

       // public static string decode
	   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;
	    }
   }
   
   var Url = {
   
       encode : function(string) {
          string = escape(string);
          string = string.replace(new RegExp('\\+','g'),'%2B');
          return string.replace(new RegExp('%20','g'),'+');
       },
       
       decode: function(string) {
          string = string.replace(new RegExp('\\+','g'),' ');
          return unescape(string);
       }
   }