Preloader and animation in same scene,how?

How do u put a animated character onto a preloader?.That mean putting a short animation on a preloader while the preloader work.I have learned how to make the preloader, in here (http://www.kirupa.com/developer/mx/percentagepreloader.htm), and add a new code in frame 3 to go to the next scene, with the code nextScene();.

Also I found a problem on the preloader, the bar will not go to the end, when is enlarged. Although the display is 100%. Any idea how to Fix it?.

P.s I am a beginner in action script and flash