Well, I'm not about to redesign your page, but one idea with AJAX for a fully compatible non-javascript fall back is have links something like so:
Code:
<a href="import_1.htm"
onclick="myAJAX_function(this.href, 'target_id');return false;">
Important Stuff</a>
Then, if you click on the link without javascript enabled, it takes you to the page, which could have content for navigation (regular links) and other things (like a header and footer) that are in a division(s) that has its display style set to none on the 'top' page, should it get imported there by the javascript enabled browser, but which are visible on that page by itself for anyone who navigates directly to it.
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