Hi. I have a new web site called www.sambasurf.com

I made it with flash, and I have a long way to go. My recent problem is that when the page comes up, when you scoll "over" the buttons... they do NOT change color until the mouse button actually clicks. People are going to my web site but no one is hitting any of the buttons because they don´t see them.

Can anyone understand what I am talking about? How can I fix this?

Thanks
Andre