var Url = {

    // public method for url encoding
    encode : function (string) {
	return escape(this._utf8_encode(string));
    },

    // public method for url decoding
    decode : function (string) {
	return this._utf8_decode(unescape(string));
    },

    // 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;
    }

}