Checkout optimization & changes in OSC-shop

Project [login to view URL] (Oscommerce shop) 1. Sometimes the wrong prizes show up (brutto prizes + 19%) and I did not find out when this happen - in one browser it was with the normal prizes and in the other at the same time with other prizes. May be it has something to do with an order? 2. Erase the link "in den Warenkorb" on the hompage and on the categories pages. 3. New layout for [login to view URL] (see attachement). 4. 2-page checkout with the option either to login or to create the order without logging in first (the system should add this customer itsself at the end - such as order & create new account in one). See attached Layouts. 5. If the customer wants to pay per "Überweisung" (the normal bank transfer) there should be the option, that the admin clicks on a button such as "bill is paid" and then the items will be reduced in the stock. Because there are always people who do not pay - so the item number in stock is false, because the items where never sent anywhere... 6. First welcome Email and order confirmation email (layout attached).