function mf_urlEncode(s_in){
	
	var s_dontNeedEncode = " *-._0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
	function isNeedEncode(c_in){
		return (s_dontNeedEncode.indexOf(c_in)<0);
	}
	function getHexValue(n_in){
		return (n_in<16?"0":"") + n_in.toString(16).toUpperCase();
	}
	
	var s_result = "" , s_resultBuf = "";
	var c_curr;
	for(var i=0;i<s_in.length;i++){
		c_curr = s_in.charAt(i);
		if(!isNeedEncode(c_curr)){
			if(c_curr==" "){
				c_curr = "+";
			}
			s_result += c_curr;
			continue;
		}
		var n_charCode = c_curr.charCodeAt(0)-0;
		if(n_charCode < 128){
			s_result += "%"+ getHexValue(n_charCode);
			continue;
		}
		var n_1 = n_charCode & 0x3F;
		var n_2 = (n_charCode & 0xFC0) >>6;
		var n_3 = (n_charCode & 0xF000) >>12;
		var b_over = (n_2 >= 0x20);
		var n_delta=0 ;
		
		
		if(n_3>0 || b_over){
			s_result += "%"+ getHexValue( n_3 + 0xE0 );
			n_delta = 0x80;
		}else{
			n_delta = 0xC0;
		}
		if(n_3>0 || n_2>0){
			s_result += "%"+ getHexValue( n_2 + n_delta );
		}
		s_result += "%"+ getHexValue( n_1 + 0x80 );
	}
	return s_result;
}