Code:
# BEGIN easyLink
RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.linkflat\.com
RewriteRule (.*) http://www.linkflat.com/$1 [L,R=301]
RewriteBase /
RewriteRule ^.+_D-([0-9]+).html$ /detail.php?id=$1 [QSA,L]
RewriteRule ^.+_C-([0-9]+)-([0-9]+).html$ /show_cat.php?catID=$1&page=$2 [QSA,L]
RewriteRule ^youtube-(.*)\.html$ /show_youtube.php?video=$1 [QSA,L]
# END easyLink