For all you that need to redirect users to another page if they don’t have Flash installed and use swfobject, just drop this code and you’re good to go:
This should go just before:
swfobject.embedSWF("xmas/happy_christimas_2009.swf", "flashcontent", "100%", "100%", "10", false, flashvars, params, attributes);
Let me know if you have a different approach.
I have found this (http://pastie.org/433193 ) while searching for a solution to my problem, but it made more sense to rely on swfobject API since I was already using it to embed flash.