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