Following NJBlackBerry's example...
Welcome meshift...You can find many threads on this question with slight variations (but the same ultimate question) by using the Search function at the top of the page...but here is one thread on that topic:
http://www.blackberryforums.com/showthread.php?t=18679
This assumes you are not using BES. If you are using BES, you should be able to use your Redirector settings in the Desktop Manager.