SAN JOSE, Calif. - Mouse potatoes, rejoice. A new company is offering Web surfers 50 cents an hour for their time online. In exchange for the loot, the Internet users must allow a bar of advertisements to move across the bottom of their screen. AllAdvantage.com plans to launch the service Tuesday. Members, who sign up for free, earn money anytime they are online and displaying the so-called viewbar, which opens automatically whenever their browser is launched. They can make up to $20 a month (that's 40 hours online) and 5 cents an hour when people they referred are browsing online. AllAdvantage.com, based in Los Altos, Calif., is run by Jim Jorgenson, who co-founded Discovery Zone children's indoor playgrounds. He said the company will not sell, rent or exchange identifiable personal information about members.