jQuery.extend({
	URLEncode:function(str){
		var str = str;
		str = "".concat(str);
		var s0, i, s, u;
		s0 = ""; // encoded str
		for (i = 0; i < str.length; i++){ // scan the source
			s = str.charAt(i);
			u = str.charCodeAt(i); // get unicode of the char
			if (s == " "){s0 += "+";} // SP should be converted to "+"
			else {
				if ( u == 0x2a || u == 0x2d || u == 0x2e || u == 0x5f || ((u >= 0x30) && (u <= 0x39)) || ((u >= 0x41) && (u <= 0x5a)) || ((u >= 0x61) && (u <= 0x7a))){ // check for escape
					s0 = s0 + s; // don't escape
				} else { // escape
					if ((u >= 0x0) && (u <= 0x7f)){ // single byte format
						s = "0"+u.toString(16);
						s0 += "%"+ s.substr(s.length-2);
					} else if (u > 0x1fffff){ // quaternary byte format (extended)
						s0 += "%" + (oxf0 + ((u & 0x1c0000) >> 18)).toString(16);
						s0 += "%" + (0x80 + ((u & 0x3f000) >> 12)).toString(16);
						s0 += "%" + (0x80 + ((u & 0xfc0) >> 6)).toString(16);
						s0 += "%" + (0x80 + (u & 0x3f)).toString(16);
					} else if (u > 0x7ff){ // triple byte format
						s0 += "%" + (0xe0 + ((u & 0xf000) >> 12)).toString(16);
						s0 += "%" + (0x80 + ((u & 0xfc0) >> 6)).toString(16);
						s0 += "%" + (0x80 + (u & 0x3f)).toString(16);
					} else { // double byte format
						s0 += "%" + (0xc0 + ((u & 0x7c0) >> 6)).toString(16);
						s0 += "%" + (0x80 + (u & 0x3f)).toString(16);
					}
				}
			}
		}
		return s0;
	},

	URLDecode:function(str){
		var s0, i, j, s, ss, u, n, f;
		s0 = ""; // decoded str
		if(str != "" && str != undefined) {
			for (i = 0; i < str.length; i++){ // scan the source str
				s = str.charAt(i);
				if (s == "+"){s0 += " ";} // "+" should be changed to SP
				else {
					if (s != "%"){s0 += s;} // add an unescaped char
					else{ // escape sequence decoding
						u = 0; // unicode of the character
						f = 1; // escape flag, zero means end of this sequence
						while (true) {
							ss = ""; // local str to parse as int
							for (j = 0; j < 2; j++ ) { // get two maximum hex characters for parse
								sss = str.charAt(++i);
								if (((sss >= "0") && (sss <= "9")) || ((sss >= "a") && (sss <= "f")) || ((sss >= "A") && (sss <= "F"))) {
									ss += sss; // if hex, add the hex character
								} else {--i; break;} // not a hex char., exit the loop
							}
							n = parseInt(ss, 16); // parse the hex str as byte
							if (n <= 0x7f){u = n; f = 1;} // single byte format
							if ((n >= 0xc0) && (n <= 0xdf)){u = n & 0x1f; f = 2;} // double byte format
							if ((n >= 0xe0) && (n <= 0xef)){u = n & 0x0f; f = 3;} // triple byte format
							if ((n >= 0xf0) && (n <= 0xf7)){u = n & 0x07; f = 4;} // quaternary byte format (extended)
							if ((n >= 0x80) && (n <= 0xbf)){u = (u << 6) + (n & 0x3f); --f;} // not a first, shift and add 6 lower bits
							if (f <= 1){break;} // end of the utf byte sequence
							if (str.charAt(i + 1) == "%"){ i++ ;} // test for the next shift byte
							else {break;} // abnormal, format error
						}
						s0 += String.fromCharCode(u); // add the escaped character
					}
				}
			}
			return s0;
		}
	}
});