Using .htaccess to Redirect Visitors

I'm using the following .htaccess code to redirect visitors (who are not coming from my IP address) to an "under construction" page while I update my site. Using this in my root HTML directory, is there any way to exclude two sub-directories from this rule? For example, I want to leave my /forum and /images directories available to the public. Can it be done?

Code: 
RewriteEngine On
RewriteCond %{REMOTE_ADDR} !^12\.34\.567\.89$
RewriteRule !^offline\.htm$ /offline.htm [L]

 

 

 

 

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