[otrs] HTML output for Event Based Notification emails

Hello, I created an event notification for ticket closures and its all working fine, but there does not appear to be a way to craft the notification message in html format (like the auto-responses). So, my close ticket notification messages look different from all the other messages, which management does not like :( Anyone know how we can control that? I have done extensive googling and greping in the Kernel directory to no avail... thanks in advance! -van