Options +FollowSymlinks
RewriteEngine on
RewriteRule ^([a-z0-9_-]*-(f|all)[0-9]+(p[0-9]+|/index[0-9]*)?.html)$ forumdisplay.php/$1 [QSA,L]
RewriteRule ^([a-z0-9_-]*-(t|p)[0-9]+(p[0-9]+|/index[0-9]*)?.html)$ showthread.php/$1 [QSA,L]
RewriteCond %{REQUEST_URI} !(index.php|.css) [NC]
RewriteRule ^(archive|sitemap)/(.*)$ $1/index.php/$2 [QSA,L]
RewriteCond %{HTTP_HOST} !^www.siteadi.com
RewriteRule (.*) http://www.siteadi.com/$1 [L,R=301]

Options +FollowSymLinks +MultiViews
RewriteEngine On
Rewritebase /
RewriteRule ^([a-z0-9_-]*.(f|all)[0-9]+(p[0-9]+|/index[0-9]*)?.html)$ forumdisplay.php?$1 [QSA,L]
RewriteRule ^([a-z0-9_-]*.(t|p)[0-9]+(p[0-9]+|/index[0-9]*)?.html)$ showthread.php?$1 [QSA,L]
RewriteCond %{REQUEST_URI} !(index.php|.css) [NC]
RewriteRule ^(archive|sitemap)/(.*)$ $1/index.php?$2 [QSA,L]