Flash Player Version Confusion

Hi Guys,

I have a silly, yet important question about Flash Player versions. What happens if I publish a flash file for the Flash 8 player, but the user only has a Flash 7 player? Specifically, I want to use the new glow filter Flash 8 provides on a navigation bar on one of my sites. Does this mean that a user with only Flash 7 player will see everything but the new glow feature, or that the user will not be able to view the file at all without the Flash 8 player?

I know that the Flash 8 player has about 70-75% penetration already, and it would be worth it to me to publish under Flash 8 if the user could still use my navigation bar but would not be able to see the glow filter I am using. However, I fear that the user would not be able to view the flash 8 file at all and since it is my navigation bar in that case I would want to avoid taht and just publish to flash 7 instead. Any advice on this subject? Thank you!