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;  
     }  
   
 }