how to create a movie from image sequence

Hi all, I've created sequence of images and want to convert them into a movie. The images are currently PNGs, but I could also create JPEGs or TIFFs. The resulting movie shall be playable on a wide range of platforms without special codec requirements (standard mplayer or MS media player must play them). Can anybody recommend me a program for this task that works on a suse 8.0 system? Btw, are there any restrictions on the dimensions of the frames? My images usually are 500x500. Thanks for all tips, Sebastian