How to configure JBoss to call a web service that is hosted on Tomcat using https

Hi everyone, I have a web service hosted on our JBoss server (version 4.3), and my web service has to call another web service which is hosted on Tomcat over SSL. I have the client certificate provide to me by the Tomcat administrator, but I haven't the foggiest idea as to how to proceed next. Can someone point me to some guide or example as to what I need to do (e.g. Install the certificate into JBoss's keystore), what changes do I have to do to my web service in order to call the web service hosted on Tomat, etc.

Thanks!