<IfModule mod_rewrite.c>

RewriteEngine On

RewriteRule ^room/([0-9]*)/([0-9]*)/([0-9]*)/ index.php?id=$1&msg=$3 [L,QSA]

RewriteRule ^room/([0-9]*)/([0-9]*)/ index.php?id=$1 [L,QSA]

</IfModule>