Problems With Flv In Mac...

Hi,I created a project to run on a cd-rom and I want it to be for both pc and mac. I have some flv videos running in this program but the problem I have is that they run perfectly on pc but on a mac they run awfull. They run very slow and the audio is all cut. What can this be? How can I solve it!Thanks for any help received!Brenda S.