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I *think* xcGal can do that. Be aware of this though;
1) Images are copyright material, so if you do not own the copyright of the images and you display them on your site without permission from the copyright owner, then you might be opening yourself upto legal issues.
2) Unless you own the site or have permission from the site owner to display the images, doing what you're suggesting is considered as bandwidth theft and is generally frowned upon.
3) Your site performance may suffer if it has to fetch images from a 3rd party site.