.htaccess rules redirects

[vBNinja]

Try

RewriteEngine On
RewriteCond %{HTTP_HOST} !^img1\. [NC]
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]

That will only work for urls that start with "img1", if you have url's that start with a dynamic digit let me know so i can fix it