Do as Heather suggested. If it's not working, make sure you have the Move tool active (or a non-drawing tool, so that it's actually changing it in the layers palette instead of the options bar for the tool).
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Cassie
My Gear: Nikon D300s w/18-200mm VR & 50mm 1.4
Software: Adobe Photoshop CS4, PSE 10, Lightroom 2
 
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