I use SWFObject2 to embed flash content into the pages.
There are 2 methods: static and dynamic.
At line of SEO, it needs to have some alternative content (fallback content) for SE bots and browsers without flash player.
Alternative content is visible during short time our flash loading. So, we need to use static method and put fallback content with install flash player button into the object tag.
From other hand dynamic method don’t need IE click flash activation.
So, it would be better to embed menu, interaction or flash game by dynamic method. http://www.adobe.com/devnet/flashplayer/articles/alternative_content.html