Hide group on click

[Keith Clarke]

Hi folks,
I have a help 'draw' group that toggles open/closed (well, visible true/false) by mouseUp on a nearby help icon. However, I'd also like to have the drawer set to invisible if clicked. So, what's wrong with this script - placed on the group?

on mouseDown
   set the visibility of me to (not the visible of me)
end mouseDown

BTW The group is just a graphic background with a single field - and the field has lockText ON, autoHilite OFF and traversalOn OFF. 

Thanks,
Keith..