Changes to Wordpress shopping cart

1, A problem: When you go into any category and select the 1st image, when you then select NEXT or BACK you are shown random images from ALL categories. This issue only seems to happen with the 1st image of a category, all others seem to work fine. 2, A problem: As you click NEXT through any category and reach the last image in the category, the next image to be displayed belongs to a different category. We need to remain in the same category and NOT to continue showing “other images” 3, On the MY-CART page there are some basic features missing: A, No ability to change quantity being ordered B, No ability to REMOVE a product from the cart C, No ability to UPDATE cart once A & B have been selected 4, NEW ADDITION: We need to have a thumbnail of the product on the line in MY-CART page 5, NEW ADDITION: I now have the Google Checkout codes you needed. On the CHECKOUT page we need: A, Option for customer to choose between PayPal & Google Checkout B, Summary of the order C, Delivery Costs to be added 6, NEW ADDITION: We need to be able to charge an extra charge for delivery. This doesn’t need to be comprehensive. All we need is for an option for the customer to choose delivery to the UK or Overseas. We want delivery as a global setting for all products and just one setting in the backend of Wordpress, like this: (prices are rough estimates for your guide) (Numbers in RED should be editable in backend of Wordpress) Delivery Costs : First Item A4 Framed : UK £10 Non-UK £20 A3 Framed : UK £15 Non-UK £30 A2 Framed : UK £20 Non-UK £40 A4 Non-Framed : UK £5 Non-UK £10 A3 Non-Framed : UK £8 Non-UK £16 A2 Non-Framed : UK £11 Non-UK £22 Delivery Costs : Per Additional Item A4 Framed : UK £10 Non-UK £20 A3 Framed : UK £15 Non-UK £30 A2 Framed : UK £20 Non-UK £40 A4 Non-Framed : UK £5 Non-UK £10 A3 Non-Framed : UK £8 Non-UK £16 A2 Non-Framed : UK £11 Non-UK £22