<IfModule mod_rewrite.c>
RewriteEngine on
Options +FollowSymlinks
RewriteBase /twg2/
RewriteRule ^(.*)twg_album/(.*)$  $1index.php?twg_album=$2 [L]
RewriteRule ^(.*)twg_image/(.*)/(.*)$  $1index.php?twg_album=$2&twg_show=$3 [L] 
RewriteRule ^(.*)twg_show/(.*)$  $1index.php?twg_album=&twg_show=$2 [L]
</IfModule>