Website app (jscript?)

I'm looking at launching a 'cost calculator' for our website. If you ever owned one of the monkey island games for PC (or f-18 interceptor on the Amiga 500) you will remember they came with a password slider, where you had to match up specific words to reveal a passcode.

I am looking at something along the same lines, which I would like to put on the homepage of our website.

I've attached an example of one that we have done a few years ago which was paper based to give a feel of what we are after.

A bit extra about the project.
1. Can't be built in flash, as an organisation of apple fanboys it will need to work on ipads/iphones etc
2. Our website is built using wordpress CMS, you will need accomodate for this.
3. The example does have our company logo on it, anyone who tries to be a smart a$$ and contact direct will have their tender dismissed immediatley, and we will notify people per hour.
4. I am not very tech inclined, nor are the people who are using it.

Finally, this is the first in what I hope to be a series of cost calculators, there will be a bigger, fancier project later on, once I get sign off from the board :)

If you need anything else, please don't hesitate to get in contact.