Restrict pointer to certain area

Is it possible to restrict the pointer to a certain part of the screen? I've got my laptop and external monitor setup like this (extended desktop):
Virtual screen 1920x1800
| |
| |
| Monitor |
| 1920x1080 |
| |
| |
|-------------------------|
| | |
| Laptop | Dead |
| 1280x720 | space |
| | |
I don't want my pointer to be able to go in the "dead space", since I won't be able to see anything I (accidentally) put there on either of the two screens. Suggestions?

Steps:-
1. Search for 'mouse jail'.
2. Spend quite a bit of time reading about programs which lock your mouse to one specific spot.
3. Find a C-program which does what you want. (or maybe a bash one, there's 2 I'm aware of).
4. Realize that it doesn't really work that well, and pins your CPU to 100% while you're trying to move to deadspace.
5. Learn to live with it.
That's just what I did when I wanted to do something about this. I have some sample xorg-linked code from one of the projects here which uses xorg callbacks, which should be able to do this without killing your CPU, but never had time to look into it. If you know C, email me and I'll tell you what I've tried before (and never gotten to work properly).
Otherwise, just live with it, or use separate-X .

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