Here is the link to a ppt on perfect competition. It's in html format, so everyone should be able to access it. http://www.reffonomics.com/perfectcompetition/frame.htm And no, I didn't write it.
Second - some more links for your economics enjoyment -
Profit Maximization MR/MC stuff: http://apecon.us/allmeroth1aa.gif
And part II to that: http://apecon.us/allmeroth2aa.gif This will become more important as we get into the other three types of markets.
http://www.reffonomics.com/costs2/frame.htm for basic cost information. There are teacher instructions in the bottom frame that explain what's going on.
http://www.reffonomics.com/costs/frame.htm More costs stuff
http://www.reffonomics.com/shutdown2.html Costs & Shutdown rule
http://apecon.us/explicitandimplicit.gif explicit vs implicit costs
http://apecon.us/longrunshortrun.gif short run vs long run
http://www.reffonomics.com/longrunatccurve.html Long run ATC
http://www.reffonomics.com/typesofcompetition.html Types of competition
http://www.reffonomics.com/spectrumofcompetition.html Spectrum of competition
There are a lot more, this guy has tons of info. But...I think that's enough to start with. :)
Note: He does separate oligopoly & cartel, which are together in your book.