If I use more than 5 videos, the entire layout of the site screws up. Can anyone else use more than 5 videos?
You mean 5 videos in one post? Try to put the <center></center> tags before and after each video code.
There are many plugins out there that will let you add videos without messing up your layout. I use this one and it works fine: http://www.daburna.de/blog/2006/12/13/wordpress-video-plugin/