Superpages.com, Yellow Book USA Inc., and AT&T Inc.’s Yellow Pages already offer listings on the Web. Now these companies and others are beginning to offer online videos, allowing advertisers to post versions of their TV commercials alongside their Web ads. The directory companies are even offering to produce new videos for businesses, which run as long as two minutes on some sites. In a video posted on Superpages.com for Kent Floral in Kent, Wash., the camera pans a flower shop where a baby holds a yellow flower and an announcer declares, “We’re not your typical dot-com florist.” More