Connect Remotely to Windows server from home

Hello, I am using a Macbook pro running leopard at home, and am trying to connect to my office server running server 2000, remotely to access my desktop, files, email, etc. My office server is setup to allow such traffic, and on any pc, I can simply go to my company's domain (essentially, www.mycompanysdomain.com/remote) select which server I wish to access, hit connect, and enter my user credentials. When attempting to go to this link on my Mac however, the connect button is greyed out.

My question is, what do I need to have installed to make this work? Is there Mac support lacking on the server? Or is it a browser/activeX type issue?

I installed Mac remote desktop client from Mactopia, and when the box asking the name of the computer I wish to access pops up, I tried entering the server domain name, as well as the server IP address, but neither of these worked.

Any advice would be appreciated, as I am not the only user in the company that has a Mac, and we would all like to have access remotely to our work PC's and data.

Thank you

-Kyle