WordPress Customization & JQuery Updates to Site

We need some customizations made to an existing WordPress website that relies heavily on custom javascript / jquery that is integrated into the WordPress back end. If you do not have experience on this advanced type of customization, please do not apply. Here are the list of of features we need updated: 1. Currently the "front page" includes a splash page background image that fades into the homepage image when you enter the site. Each background slide can be added via WordPress using custom fields. We'd like to update this functionality to include 2 images on the splah page & 2 images on the homepage. Each set of images will cross fade back and forth . The images will be added using custom fields in WP. 2. The page navigation uses jquery to animate and appear. We need to add custom drop down menus that open and closed when specific pages are clicked. The navigation pulls from the WP pages that are currently setup. 3. Sub-menus in the same navigation will need to open and close when clicked on. (Similar to item #2) Please submit a timeline to complete these items as well.