How to turn off one monitor without disconnecting it

I have two monitors on the mini, one is 24 connected with mini-dvi to DVI and another is 19 connected with mini-displayport to VGA.
Most of the time, I only use the 24 one and don't need the 19 one. However, if I don't disconnect the cable, the Mac still think the 19 one is connected and I can move windows onto it. So I have to connect the cable when I need it and disconnect it after using, every time!
Is there a software way (such as a shortcut) to turn off a monitor without disconnecting the cable?

As gavinlufc said, sometimes it works to power off the monitor you don't want to use. But that doesn't always work because in many cases the Mac will detect the monitor as being present regardless of whether it is powered on or powered off.
Unfortunately, there is no other way to do what you desire short of unplugging, as you are already doing. This feature gets requested from time to time by others. You could file a request with Apple through the OS X feedback page.
http://www.apple.com/feedback/macosx.html
I just put in such a request. The more they get, the more they will consider making the change.

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