SMITHTOWN - Officials say the gas shortage on Long Island isn't improving in part due to the public's panic. "There's definitely some panic buying," Long Island Gas Retailers Association President Kevin Beyer says. "People should just wait 'til when they usually purchase their fuel. I don't think they should be out here panicking and thinking that they're not going to get fuel." But Beyer says there are also problems with supply. Damage from Hurricane Sandy forced some fuel depots to temporarily shut down. Yesterday, barges had to stop due to the nor'easter. Now, drivers say gas lines are slowly getting shorter across Long Island. There are 4,000 gas stations on Long Island. About 200 are still without power or waiting for storm-delayed deliveries.Odd-even gas rationing to take effect tomorrow on LI