function encode(str) {
	var s0, i, s, u;
	s0 = "";
	for (i = 0; i < str.length; i++) {
		s = str.charAt(i);
		u = str.charCodeAt(i);
		if (s == " ") {
			s0 += "+";
		} else {
			if (u==0x2a||u==0x2d||u==0x2e||u==0x5f||((u>=0x30)&&(u<=0x39))||((u>=0x41)&&(u<=0x5a))||((u>=0x61)&&(u<=0x7a))) {
				s0 = s0 + s;
			} else {
				if ((u >= 0x0) && (u <= 0x7f)) {
					s = "0" + u.toString(16);
					s0 += "%"+ s.substr(s.length-2);
				} else if (u > 0x1fffff) {
					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) {
					s0 += "%" + (0xe0 + ((u & 0xf000) >> 12)).toString(16);
					s0 += "%" + (0x80 + ((u & 0xfc0) >> 6)).toString(16);
					s0 += "%" + (0x80 + (u & 0x3f)).toString(16);
				} else {
					s0 += "%" + (0xc0 + ((u & 0x7c0) >> 6)).toString(16);
					s0 += "%" + (0x80 + (u & 0x3f)).toString(16);
				}
			}
		}
	}
	return s0;
}