RewriteEngine On
RewriteRule comic([0-9]+).htm /index.php?id=$1 [QSA,L]
RewriteRule scripts/ / [R]
RewriteRule config.php / [R]
RewriteRule header.php / [R]
RewriteRule footer.php / [R]
RewriteCond %{REQUEST_FILENAME} !.png
RewriteRule images/ / [R]
RewriteCond %{REQUEST_FILENAME} .htm
RewriteRule (.+).htm $1.php [QSA]