How to do screenshots on a iphone device without pressing the buttons?

I have a iphone3gs and the lock button stopped working, so i can't do screen shots now. Is there another way i can take screenshots? If so please tell me how.
(I'm 13 by the way so nothing to technical lol)

If it is just an image you want to save, you can hold on the image and an option will show up below saying copy or save image.