Warning: I'm new to this router and modem stuff. . I have a wireless 2wire 2701HG-B modem/wireless router. It works great, but there are a few dead spots in the building that I want to fix. I'm looking for something that will boost the signal to cover the whole building. I'm also trying to keep all this on one network so I don't have to reconnect if I go to another part of the building. What do I need to do this? Any help or ideas are appreciated.

thanks,
Tom