Here is a quick and easy way to find out the location of the FSMO roles. It works from Windows 2008 to Windows 2012, I’ve not tried it on 2003, but then you should of upgraded by now anyway!
Open a Command Prompt.
Type: netdom query FSMO
Obviously on my SBS server above they are all going to be in one place, but in larger environments, they will quite often be split up and moved from server to server as and when new hardware is introduced and old hardware retired.