cart page design for virtuemart

I want to add a simple functionality to the checkout page of Virtuemart. Normally there is a standard shipping adress selected and there is a button to add another shipping adress. See attachment ([login to view URL]) The new situation: The customer is always logged in when he makes an order (no tweak needed) so the shipping adress is already filled in. Now the customer can choose two optons: O Send the products to the standard adress (this adress is already filles in in de account of the user) O Send the products to another adress (when clicked the user can fill in another shipping adress, this functionality allready exist in virtuemart2, see attachment [login to view URL]) Also the customer can select a shipping week (this is a simple drop down list with a choice of the shipping week for the goods) Thats is. Please check the attachment. This is a simple project and I need it done good and fast. Best Regards, Roy