iPhone movie in iWeb website on mobileMe doesn't play on Safari for Mac

Hello everyone, quick question:

recorded a movie with iPhone 4, imported it to iPhoto.

Created a website with iWeb and placed the movie from the media browser.

Uploaded it to MobileMe.

Does play on Safari for iPhone, iPad, Firefox for Mac

Does not play on Safari for Mac (Mac 10.6.7).

Found a couple of discussions but no solution.

What is the issue?

Thanks for your help in advance.