I'm not really sure there is a problem ...
There are really only 3 scenarios you're likely to encounter here:
1) A visitor hits your page and already has a flash player installed - no problem.
2) A visitor hits your site and hasn't installed a flash player yet, in which case the 'codebase' attribute of your OBJECT tag and the 'pluginspage' attribute of your EMBED tag contains the URL to download the flash player, and this will prompt the visitor to download and install the appropriate plugin - no problem.
3) Your visitor is a technophobe who has palpitations just sitting down at their keyboard and can't possibly be expected to do something as 'way out there' as install a plugin for their browser - in which case, your OBJECT tag tells them:
<object ... >
<param ...>
<embed ...></embed>
If you really want to use this website, you'll get over your technophobia and install a flash player - otherwise, you're someone else's problem
</object>
... no problem