RewriteEngine On
RewriteRule ^t(.*).html showthread.php?t=$1 [L]
RewriteRule ^t(.*)-next-thread.html showthread.php?t=$1&goto=nextnewest [L]
RewriteRule ^f(.*).html forumdisplay.php?f=$1 [L]
RewriteRule ^f(.*).html?pagenumber=(.*) forumdisplay.php?f=$1&pagenumber=$2 [L]
RewriteRule ^u(.*).html member.php?u=$1 [L]
RewriteRule ^(.*)-(.*)-post.html showpost.php?p=$1&postcount=$2 [L] 