[gnome] dual monitor - binding to virtual displays

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http://ubuntuforums.org – Hello! So I have yet another dual monitor setup question. I am using ubuntu 12.10, with gnome classic (not unity) I have a laptop with my LCD screen (duh), and an external monitor that is connected most of the time, but not always, and sometimes I have to disconnect it while working to use it for other things. Problem is: When the external monitor is connected, I use that as my main display, and use the LCD screen only for having the reference manuals there, etc. So when the external monitor is connected, it should be the main monitor (with the status bar, and main menu, etc), when it is (Hardware)