Need a browser bookmark or app done.
Refer to [login to view URL] and look at their Clipper tool.
Basically, a simple button with a simple installation. User should be able to click on the button on their browser window and it'll detect all the images on the webpage that are of a adjustable dimension (200x200pixels minimum for e.g.).
Can be an app as well. Just has to work across IE, Chrome, Mozilla and Safari at least.