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		 Double click the layer that's locked, that's what I always do.  That allows you to turn what photoshop is thinking is a background layer into a real, editable layer.  Also, make sure to save it in the .psd format if you want to retain your layers and such. 
		
		
		
		
		
			
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				If you're flammable and have legs, you are never blocking a fire exit.  - Mitch Hedberg
			 
		
		
		
		
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