some flash players allow you to "zoom". to do so, you may need to click on the embedded player on fanpop which will take you to the host site. on the host site look for a zoom button on the player. click it and see if the zoomed view suits you better.

note that the playback window may be larger, but the quality of the video won't necessarily be any better since the compressed source material is already fairly low quality and generally best viewed in the smaller video playback window.