Ira Eaker, co-founder of the actors newspaper Back Stage, died June 26 following surgery in Florida. He was 80.In 1960, Eaker launched the paper with Allen Zwerdling. The two men were co-publishers, with Eaker serving as advertising director and Zwerdling as editor. In 1986, they sold it to Billboard Publications Inc. Before Back Stage, Eaker had served as advertising manager for Show Business Weekly. He is survived by his wife, Lee, his daughter, a son, and two grandchildren.