Laker Girls adheres slavishly to the formula established by those "Dallas Cowboys Cheerleaders" TV movies of a decade or so ago. We follow the progress of three aspirants (Tina Yothers, Paris Vaughn and Alexandra Paul) for the cheerleading squad of the Los Angeles Lakers. There's the standard "den mother" character (Jean Simmons), and lots of prattle about the dedication and responsibility required of each new Laker Girl