That depends on if the copy is wrapped in JS tags or not. Otherwise, it's just like any other site optimisation. (60% seems like a lot of JS BTW)
I agree with SEbasic, seems like quite a bit of Javascript. If the content is not "wrapped up" in the code, I would suggest moving the javascript to a .js file for starters.
If javascript has the content include it into a sitemap. A simple sitemap will improve linkage between javascript/flash pages.