I'm looking for a tool that I'd swear I've seen in various sites, but just can't find. It allows a user to grab the corner of a thumbnail and stretch the image out to a larger view (maintaining aspect ratio). So rather than a Lightbox style pop-up, the larger image is just viewed on the same page, and snaps back to the thumbnail when the mouse is released.

I'm hoping someone knows of a tool that does this, I'm not really looking to code it up from scratch. Unless it's dead simple

Dave