function HTTPTran(St : String) : String;
var i : Integer;
begin
  Result:='';
  for i:=1 to length(St) do
    if St[i] in ['a'..'z','A'..'Z','0','1'..'9'] then
      Result:=Result+St[i]
    else if St[i]=' ' then
      Result:=Result+'+'
    else
      Result:=Result+'%'+IntToHex(Byte(St[i]),2);
end;