I am terribly new into web development. So pardon my ignorance. If you feel like having a good laugh reading my question ... go ahead. Have fun. My question is ..

Pls open this link. http://www.gowristbands.co.uk/order.php

In that you see step 1, step 2, step 3, etc .. . here you can select an option in step 1 and based on that contents in step 2 changes and based on the selection on step 2 contents in step 3 changes. Based on the selections an amount calculator is also cumulatively adding up the amount. I want to create something similar. What technologies should I use. Is it just HTML or is it also jquery and is there something else too. What is this thing called so that I can search on the internet on how to do it.