Prevent Flash Player Security window on Mac

Hi

We have created a banner using Flash CS5. This output SWF is part of an HTML webpage.

Now, when our client launches the HTML page on his Macbook, he is getting the Adobe Flash Player Security dialog box from which he has to enable the security settings. The client is concerned that every visitor to the webpage might have to do this and those who are not willing to do might never visit the webpage again.

So, is there a way we can avoid that from our (developer) end?

Thanks in advance.

Sreekanth