code to design screen in room

hi, I try to understand how works the OM open source community in order to contribute in the future. I download the source code and I check file to understand architecture. For this moment I try to understand how is design the swf main screen when you enter in a room. So, on the left I see the

hide/show user list screen

hello, I would like to cutomize my OM environment (debian squeezy / OM 3.0.2) and I would like to know if : - it is possible to hide the user-list on the left screen when you enter in a room ? - it is possible to auto-close the user-list when you enter in the room - it is possible to hide