creating a cronjob

Here is my delima. I run a free web hosting community on a shared server. I use WHM with Cpanel I offer subdomain addresses. I put money back into the service by placing banner ads on users sites. I do this by editing each users .htaccess file to point to banner code. however, if the user posts his/her website to the server, it corrupts what I am trying to do. Is there a way to setup cronjobs to insert this code every 60 minutes or so? If so, how? Thank you all for your replies.

BirdDog

 

 

 

 

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