How do i charge my camera using USB, casio exilim 7.2 megapixels?

ok, im going to thi s5 day church camp tomorrow at 8AM, so i really need to do this quick so i can sleep. Its my brothers camera, and he lost the charger and USB adapter, so i needed to get this camera, so i looked around our hole basment and found the USB, so i plugged it in to my comp, nothing. my ps3 charges it controllers, so i plugged in, nothing. I am using a casio exilim 7.2 megapixels camera. And i dont have the box or manuel, I am googleing like crazy cuz i need this. If there is some way to charge, thank you and tell me please!