Assistance with Magento Ecommerce Site

We have a client whose site was created using Magento eCommerce. We'd like your help with the following 3 issues: 1. IE6 Compatibility: The site is not compatible with IE6. Please make the site viewable in IE6. 2. Menus are not dynamic. The client needs to be able to add new pages and their corresponding submenus to the existing top menus. 3. WYSIWYG Editor for the CMS (TinyMCE) is broken and needs to be fixed. There are also some other revisions and some shopping cart work in the immediate future, but we will start with the above tasks. Please estimate the time it will take for the above tasks. Thank you!