Expandoo expands images when they are clicked, much like a lightbox, but without opening anything new.
Admin panel - General settings
Admin panel - Animations
Admin panel - Tooltips
Click image to start transition
With optional shadows, 3D and tooltips
Slides and expands
Fills the width of the post or a predefined width, parent etc.
Full size image, tooltip changes and a new click reverses the image to it's original size