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LOS ANGELES (CNN) -- A bad hair day in Hollywood could mean a bad movie. That's where stylist Susan Lipson comes in. "When you're on the set 12 to 18 hours, you have to keep the style looking good," she says. Lipson has worked 17 years as a hairstylist for movies and television. With what she has learned, she has started On Set, a motion picture hair academy. "We teach period hair from 3000 B.C. to now." Lipson says you may be tops in the salon, but if you want to work in movies, you've got to know a '40s "do" from an 18th-century one.

Showbiz Correspondent Gloria Hillard reports.