ReDim And Preserve For An ASP Array

I am implementing a site where an admin user can log purchases of items into a DB.
Obviouslt, one purchase can consist of many items. I am therefore trying to implement a 'Cart' idea wherby the user adds the items to be purchased to the cart and then completes the purchase once all items have been added to the cart.

i aM IMPLEMENTING THE CART FUNCTIONALITY VIA AN asp ARRAY. nOW I CAN Do THIS NO PROBLEM, APART FROM THE FACT THAT, i declare an array of size 10, with 5 attributes to each element. i.e.

Dim purchaseCart(10,4)

The problem is, i want to be able to ensure that if the user decides to purchase more then 10 items, that the array can be ReDimensioned to suit i.e. increase size by one every time another element is added, after it has reached its maximum size!! Code: