TODAY: Fix, Change, or Adapt This JavaScript Code So It Works

### I NEED THIS FIX TODAY ### NO AUTOMATIC BIDS ### READ EVERYTHING Please check the DEMO on the URL below URL: [login to view URL] 1) If you click on tab "Pizza 1" [login to view URL] 2) And then click on "Next" button. [login to view URL] 3) when you click "Next", you will see how the items below will start moving [login to view URL] THE PROBLEM 1) Click on next tab "Pizza 2", now the "Next" and "Prev" buttons don't work anymore Obviously the problem is because this JavaScript was created for only one tab with specific IDs I want you to fix this in a way, that you DON'T USE TOO MUCH CODE I want to keep the demo as light as possible, the less code the less I don't want JQUERY, I only want PURE JAVASCRIPT I want to also the code to be VALID, meaning you in this case repeated IDs cannot be used like the id="container" ### TELL ME "I CAN FIX THIS JS" SO I KNOW YOU READ