Brownsugah, Your post doesn't give to much detail to try and help you. It helps if you can provide a link to your page where it's not working, your code, etc. But all I can say is check your code and URLs carefully. Make sure it's on the right place on MobileMe. If it's dynamic flash you can't use the typical flash code for iWeb you must create your own html file with the code then iFrame that in.
I've answered this question on the forums here already. Please search the forums before posting new questions.