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For Mozilla browsers only you can use CSS
cursor: -moz-zoom-in; and cursor: -moz-zoom-out; Andrew
I tried to use this to make it change when hovering over an image, but for some reason it only worked the first time. But maybe you can edit the code.
<image onMouseOver="javascript:body.style.cursor = 'url(lens.cur)';" onMouseOut="javascript:body.style.cursor = 'default';" src="image.jpg">