Photoshop CS4- how do you change the background to transparent?

stoogle100

New member
Hey im using Photoshop CS4 and every time I open an image (e.g a jpeg) the solid background that appears when you erase the image or crop it is coloured. How do you change this (so that the background is the little squares instead)? Can you also configure it so that all of the images will open with these properties? Thanks.
 
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