Nice work, magna_power.
I've seen people use their finger or a small piece of tape to focus. Another trick I found that works is:
1) Put your finger down on the surface
2) Push the shutter release half-way to lock the focus...it's that half-click you feel that makes the camera beep to let you know it's focused
3) Remove your finger while still holding the shutter release
4) Push the shutter release all the way down to snap your picture