RewriteEngine On

RewriteBase /

RewriteCond %{REQUEST_FILENAME}	!-d	[NC]
RewriteCond %{REQUEST_FILENAME}	!-f	[NC]

RewriteRule ^([a-zA-Z0-9-]+).html /index.php?rightcol&page=$1 [L,QSA]
RewriteRule ^([a-zA-Z0-9-]+)[/]{0,1}$ index.php?leftcol&grp=$1 [L,QSA]
RewriteRule ^([a-zA-Z0-9-]+)/([a-zA-Z0-9-]+).(html|php) index.php?leftcol&grp=$1&page=$2 [L,QSA]