SQL*FORMS messages

SQL*Forms questions:

1. Is there a simple way to clear the message line? I'm trying message(' '); but that's dumb.
2. I can't find a way to turn off a message that says, "Please acknowledge message." that Forms generates. As you can see below, I've tried :SYSTEM.MESSAGE_LEVEL.

   DEFINE PROCEDURE

      NAME = MEM_MAP
      DEFINITION = <<<
      PROCEDURE mem_map IS
      BEGIN

	...

      EXCEPTION
        WHEN NO_DATA_FOUND THEN
          MESSAGE('Working...');
          SYNCHRONIZE;   /* Put message on screen, NOW! */
          HOST( 'BIG HAIRY TIME-CONSUMING THING'  , NO_SCREEN );



          :SYSTEM.message_level := '25';
          MESSAGE('           ');      /* Clear message line */
          SYNCHRONIZE;
          :system.message_level := '0';



      END;


      >>>

   ENDDEFINE PROCEDURE Thanks,

Jeff Chamblee      | I am but mad north-north-west. When the wind is southerly,
CSC Laurel, MD USA | I know a hawk from a handsaw. 	-- Hamlet