The DNS entries for my Jabber server are CNAMEs for my main domain. I guess this is good news, as all you need is the IP address of your DreamHost webserver, even though you're not using it. I hope your domain still exists here, even though DNS doesn't point to it.
If you click on Domains -> Manage Domains, then DNS next to your domain name, you should see all the info you need. For my domain, my Jabber entries are:
(minus the .mydomain.com, as that's implied within DNS) they are all CNAMEs for mydomain.com, which is the IP address of MYWEBSERVER.dreamhost.com