Added workaround for cache bug in firefox (It ignores no-cache at times).
Fixed the bugs in the install for 'contact us' and in the included file.
Note I have not touched the account_edit.php, account_password.php or links_submit.php files, so they may still be bugged.

Support forum is at: http://forums.oscommerce.com/index.p...4205&start=500

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