My movie is finished and I am ready to save it again.  However, the first time I saved the movie (720x480 widescreen) and viewed it on my 42" HD widescreen, some of the images were cut off on the top and bottom.   Which format would I use to eliminate this?  What I see is HD 1080p - 1920x1080 widescreen; HD 720p, 1280x720 widescreen; widescreen 480p 720x480p widescreen and standard definition 640x480p.  Guess I don't understand what they all mean and I appreciate your time.  Thank you.