how to detect flash version in browser ?

[eluser]Mr-H[/eluser]
thanks for reply.
but its said that i can made it also whith php:
Using JavaScript to detect Flash Player http://www.adobe.com/support/flash/how/shock/javaplugs/

Flash Player Detection Kit http://www.adobe.com/products/flashplaye...ction_kit/

i need to tell users to upgrade there flash to version 10.1
but how?