Update cart.php

Added check so if customer adds less than the minimum product quantity, they are redirected to the product page.

This is to save customers headaches when adding products from pages that utilize the AddToCart function in common.js where they would normally receive the minimum quantity warning once attempting to checkout or visiting the cart page.

I decided not to set the quantity to the minimum quantity value because customers may click Add To Cart multiple times.

Also within these changes were a couple formatting issues with the amount of tabs used.


Cheers,
Joel.