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i have not noticed a penalty for using .shtm /.shtml filetypes
(of course you can also use includes with all kinds of filetypes including plain .htm if the server is configured for it)
however if you are using an "include" navigation system and you have linked every page to every other then you may not have helped your ranking
> However if you are using an "include" navigation system and you have linked every page to every other then you may not have helped your ranking.
I've been using includes since early 1996 and have seen no negative effect on ranking. In fact, it is quite the opposite. It is the best way to filter PR from the primary pages through the site. Not only that, it also gives your visitors a common navigation theme that they become familiar with after a few clicks.
i was meaning if you used a generic included nav system on every page then each page links to every page which spreads the pr handed down evenly.
i try to focus the pr onto selected pages
my suposition is that if all pages are linked together equally the pr will be equal on each page (exception of homepage due to incoming links)
i don't think a totally interlinked site damages you or is penalised, merely that some kind of linking focus can give a boost to some areas of a site at the expense of other areas..
Check if your server support SSI on pages with .html or .htm extensions.
You can do this by creating an .htaccess file in your site's root directory (or edit the existing text file) and add the following line:
AddHandler server-parsed.html
The above line will tell your server to support SSI on all files ending in .html, assuming your Web host supports it.