Chris Kirkland, goalkeeper for Sheffield Wednesday, was assaulted by an unruly fan during his team's match against rival Leeds United on Friday.The violent attack came immediately after Kirkland conceded the equalizer to Leeds striker Michael Tonge during the 77th-minute.The crazed fan ran onto the pitch from the away end before shoving the former Liverpool goalkeeper on his blind-side, leaving him on the ground and needing treatment. The fan was able to escape and hop into the stands before police could detain him. "I'm embarrassed to be the Leeds manager tonight," Leeds manager Neil Warnock said after the match. "He's a moron, an idiot. I don't mind rivalry but this guy should be made an example of, prosecuted and be put in prison."What a disgrace. And what a coward that fan must be.