[Typo3] getting .js variable to TS?

[T.Joga]

I would like to add flash-navigation menu on the page, but I also want 
to check if user have proper flash version -> if not -> add text-based menu.
I can check flash version, but dont know how to use this info:
page.5000.wrap = <script>document.write(flash.version);</script>

is it possible to get that "flash.version" variable in use when 
constructing template:
[if flash.version >= 6]
subparts.navigation < temp.flashmenu
[else]
subparts.navigation < temp.textmenu
[end]