windows 7 - prevent monitor switching when closing laptop lid

I got one of those little lilliput external monitors for my laptop. When I close the lid on my laptop, it switches the primary display to external monitor. I want to prevent it from doing this, and instead just blank both screens but not alter the monitor configuration.

I looked at the Power Options "Change what to do when closing the lid" option, but that just gives options for Sleep, Hibernate or Do Nothing. I want to Do Nothing, and prevent the monitor reconfiguration. Any ideas?

Thanks in advance!

Oh, BTW, I'm running Windows 7 Ultimate on an Alienware with the ATI graphics card.

CLARIFY: My reasoning for this question is that I often carry my laptop back and forth between rooms, but not far enough that I'm going to shut it down and restart. Normally I just closed the lid and picked it up. The problem is, now when i close the lid, it switches the primary display to the external, and then when i reopen it, it switches back to the internal monitor. This then winds up futzing up layout things, such as gadgets and sticky notes.