How to do this image zooming trick in a browser?

Question

I would like to do the following trick in a browser:

Create three image files of different size (small, medium, large) from one picture.

• First, display the small image in a browser.

• When a user zooms in the small image replace it with the medium one.
  Now the user can scroll it within the window up and down, left and right.

• When a user zooms out the small image replace it with the small one, etc.

I would prefer JavaScript (Flash is the second option). What tool would you recommend ?

Answer 1

A quick google search turns up:

http://www.intenseblog.com/design/8-amazing-javascript-image-zoom-scripts.html

and:

http://www.hotscripts.com/blog/javascript-zoom-scripts/

Several of these libraries appear to do what you want.

Answer 2

Would this work for you?

http://www.netzgesta.de/shiftzoom/

This might be for image data that is much larger than you are interested in.