Need help with on slider, change image

[jaymainscreen]

Hello,

I am trying to replicate(not fully) the functionality of the flash below but with html.
http://www.forestersfriendlysociety....gs-calculator/ (Press Calculate)

Essentially what my aim is that when the slider has been dragged, a new image is changed according to the value of the slider.

Any help would be greatly appreciated.

[jaymainscreen]

An example is like below.
http://www.visibilityinherit.com/cod...r7-example.php

But instead when the vertical slider is moved, only one image is shown.