How to fix a warped canvas?

Can anyone advise me? I just bought an 'original' acrylic on canvas painting from overseas. It has arrived kind of 'warped' ie: when i put it on the wall, the bottom of the painting protrudes outward. It is canvas stapled onto a light ( not heavy ) wood frame. I don't have the right equipment to... show more Can anyone advise me? I just bought an 'original' acrylic on canvas painting from overseas. It has arrived kind of 'warped' ie: when i put it on the wall, the bottom of the painting protrudes outward. It is canvas stapled onto a light ( not heavy ) wood frame. I don't have the right equipment to remove the staples. I don't want to return the picture as i need to give it as a birthday gift in less than a weeks time. Any ideas? Many thanks in advance! Jaycee
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