redirect port

I have been using Apache/2.2.3 and Tomcat 5.5 as standalone servers. I'm 
adding ssl with mod_jk and mod_proxy_ajp to access tomcat via ssl.

I access my static content and cgi via http://www.mydomain.com/ and use 
mod_rewrite in .htaccess to redirect to https. This works fine as desired.

I can access my webapp via http://www.mydomain.com:8080/MyWebApp, and this 
is the url users have book marked. This continues to work. I can also access 
https://www.mydomain.com/MyWebApp.

What I'd like to do is force a redirect from 
http://www.mydomain.com:8080/MyWebApp to https://www.mydomain.com/MyWebApp

Note; tomcat is not under the apache webroot

Any assistance appreciated.

Thanks

Tim