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Philosopher - 10:50 pm on Feb 11, 2011 (gmt 0)
I would NOT recommend that.
Two main issues..
1) The search engines don't do javascript well. G is better about it than Bing, but I'm still not convinced that links found by G within javascript carry the same weight as regular hypertext links. For any search engine that doesn't handle javascript, or doesn't handle it well, you will effectively kill your site as they won't be able to find the links to the internal pages.
2) Any user that has JS off will not be able to use your site at all.
Why not achieve the same thing via a server-side include. You should have that ability regardless of the platform the site is based on.