Custom PHP Work

4 Scripts with issues that need to be fixed. The issues are image upload, comments, emailing of form data and displaying of data on webpage. I also need alterations to php shopping cart script. 1 - Large image when thumnail is clicked. Open in a new window. 2 - Sales tax needs to be calculated by state. New York only. If the customer is from a different state the tax should be ). 3 - Shipping amount to be calculated automatically vs current way with a dropdown in the checkout. 4 - Fields in admin under options to add text to shopping cart and checkout. 5 - The category list menu. The main Category needs to have larger font and bold. The sub categories should be smaller font and not bold. 6 - Upon checkout I want to offer customer ability to add similar products to the cart by listing them on a seperate page between shopping cart and checkout. 7 - Need checkout to be secure. 8 - Orders in admin need to show how paid. ex. google, amazon, paypal or credit card 9 - Upon uploads existing products are updated and new products are added. 10 - Check boxes to delete several products at a time. 11 - Integration with Commentics rating script so customers can leave feedback on products and they will show below the product information on the more information page of that product.