Plugin to enlarge images

Plugin to enlarge images

Hello everybody,
I'm looking for a plugin to expand images in a webpage.
The effect I want to achieve is like the one shown here:
http://www.dynamicdrive.com/dynamicindex4/expandoimage.htm

BUT: I want to use *two* images, like Fancybox and similar plugins do.
I.e. the page loads the thumbnails: when the thumb is clicked, the big image expands inline and the rest of  content "flows" down.

Thanks in advance.
Ghizza.