I've got to think this is a common request, but I didn't find an answer in my searching...

We are using Email-To-Case.  After a case is created, the support person will send an email to the customer from the support mailbox.  When the customer replies to that email, it is routed to Salesforce using email-to-case and the reply is automaticaly attached to the case because of the ID number in the email.

What I need to do is figure out how to make it so that an email alert is sent to the case owner to notify them that a customer's reply has been attached to their case.

Does anyone already have some code that does this?