In more troubling news for the struggling online movie rental business, the website CE Pro said Friday that Vudu was laying off about 16-18 members of its 100-person staff, including co-founder Patrick Cosson, who had served as its marketing chief. A Vudu executive, Mark Donnigan, told the website that the firings were part of the normal process for a startup that expanded quickly. "We just have to figure out how to get back on track in terms of spending," he said. Earlier this month Vudu created a "bargain channel" that allows users of its settop box to stream a selection of 99 movies for just 99 cents each.