User login dependant on if there's a "www." in the url

[Quillink]

This is what my .htaccess looks like with your code:

RewriteEngine On

RewriteCond %{HTTP_HOST} arvyre\.com$
RewriteRule (.*) http://www.arvyre.com/$1 [R=301,L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^get/([0-9]+).gif$ /adoptables200/siggy.php?id=$1 [L]

It doesn't seem to be working. Is there anything incorrect in the extract above?