[otrs] note external and internal

Hi I would like than note-external be proposed by default when a agent choice "Note" when a ticket is displayed. Now it's "note-internal" which is the default. How can I modified this ? I search in the Kernel files but I didn't find , i search in "system configuration" but I dont find or I dont understand ;-) thank for your help, -- Serge ALGAROTTI [http://www.cemef.ensmp.fr/] Ecole des Mines de Paris-CEMEF