on mousedown
  global mainframe,ww
  if ww = the clickon then
    nothing
  else
    go to frame mainframe
    set xx to the name of member(the membernum of sprite the clickon)
    set the visible of sprite value(xx) to true
    set ww to  the clickon
    hide
    set the visible of sprite value(xx) to true
    
    updatestage
  end if
end