Yes you can write a 301 redirect in your htaccess to redirect all of your pages.

It's also advisable to be sure to have an xml sitemap for Google to see any and all changes to your website.

The PHP include is a great tool, I've used it. Very convenient when adding or changing around links -- just change the one file instead of editing every page. A must-have for any website that intends to grow, unless the site is utilizing a CMS (content management system i.e. Mambo, etc)

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