As a follow-up to Wulf, make sure the the Auto Focus mode is set to One-Shot - this means the focus will be locked when you hold down the shutter half-way.
If you use AI Servo, it will automatically refocus as the subject moves.
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-Jennifer
Sites: flickr | iffles.com - phototalk for the rest of us...
Gear: Canon Digital Rebel XTi, 18-55mm kit lens, 55-250mm IS, Canon 10-22mm f/3.5-4.5 USM, Canon EF 50mm f/1.8 II, Canon 24-105mm f/4.0 L IS USM
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