i need a avi splitter to chop off starting of a movie.

hi i have this movie which is divx and in .avi format and i want to remove the 3 mins of advertisment in the starting.pls recomend a avi splitting sftwr which
has a sort of slider or something by which i can choose the part i want to keep.i want simple user interface.
i only want to remove the starting ads. i don't want to recode or any such thing.just simple cutting.no time cunsuming process.ok