function FormatStringforCGI(str: string): string;
 var
 i: integer;
 begin
 for i := 1 to Length(str) do
 begin
 if str[i] in ['a'..'z', 'A'..'Z', '0', '1'..'9'] then
 Result := Result + Str[i]
 else if Str[i] = ' ' then
 Result := Result + '+'
 else
 Result := Result + '%' + IntToHex(Byte(Str[i]), 2);
 end;
 end;