Dropdown menu for Zen Cart Categories

I need a javascript or Ajax dropdown menu that is tied to the Zen Cart category system. If it can be done via CSS and not javascript, even better. Adobe Flash may not be used at all please. Requirements: A. Functionality: - Create dynamic drop-down menu for home page only using CSS, Javascript, Ajax (any or one) for an existing Zen Cart installation. - At rest, the menu shows the top-level categories - Upon mouse-over - subcategories drop down - Upon further mouse-over on subcategories, additional subcategories (if any) drop down - The menu must be dynamic in that is must pull category names and links from the Zen Cart system so that additional subcategories will automatically update the menu like the normal category menu updates. B. Design - Menu should match general design and theme of website - Drop down action should be smooth and "flashy", not just simple drop down. The effect must be clean, but interesting. - Designer should use backgrounds and graphics to enhance the visual aspect. Be creative. Additional terms: All source files must be provided. Payment - 100% in one milestone escrow payment released upon our approval and acceptance of completed project.