2011-10-17 5issues in Magento shop

Hi , 5 issues: 1)I have a multistore Magento shop. Now every store has it own cart. That must be changed. User must be able to buy in separate stores with 1 cart 2) Need newsletterscuscription in menuline (in backoffice 2 tables, 1 for B2B and 1 for B2C) 3) Topbanner must be changed (see attachment) 4) we have 1 landingspage and 4 substores. Menus of substores must be different from landingspage (see attachment) 5) Need a bannerbox in the left colomn. (see attachment) See detailed in info in attachments. Kind regards John