Canon Elph Memory Card

How to unlock my memory card from my digital camera?

I have a Canon Power Shot SD1000 Digital Elph. I have a map memory I took pictures, and somehow the memory card is locked. I let someone hold the camera, so I do not know how he has locked in the first place. Do not let me access my files, and I know it's not the memory card from the camera memory card because the other works. What should I do ?!?!?!

If you look at the memory card itself must have a switch on it. Move cursor back and ready to go!