Subway Restaurants, in conjunction with the Cartoon Network and DC Comics, is launching a Justice League promotion this week.  Subway's Kids Paks will each feature one of seven different Justice league premiums:  a Batman or Superman formed from a translucent material and painted from the inside, a Flash or Wonder Woman detachable figurine on crazy straws, or Hawkgirl, Green Lantern, or Martian Manhunter articulated action figures.  Nationally produced p.o.p. will support the promotion; no word on TV.  Subway, with over 12,000 restaurants, recently passed McDonald's in the number of restaurants open in the US.