If the usual docs aren't enough for you to see your problem (perlref, perltoot, perlobj, perlbot), you might read the slower, more detailed discussion that's offered as a sample chapter from Object Oriented Perl.

Update: Oops! Forgot merlyn's perlboot. You know that feeling you get when you spot a movie star at the grocery store? I'm having that feeling right now.

BCE
--Your punctuation skills are insufficient!