Web site designers like to keep the size of their pages small, in order to
fit more content on the page and to reduce the time they take to download.
This means that it's common for a web page to include thumbnail photos which
are uncomfortably small to view, but which can be expanded by simply clicking
on the small image. Trouble is, when you want to expand an image, how do you
know whether it's clickable or not? Do you have to waste your time clicking
thumbnails in order to find out which ones can be expanded? Not any more.
Download a free add-in for the Chrome browser and, on any supported site,
merely hovering the mouse over an image will display a larger version if one
is available.
http://www.techsupportalert.com/content/browser-add-zooms-thumbnails-mouse-hover.htm