Design Site Theme for Ecommerce ASP.NET website

Redesign an Ecommerce Website using BVCommerce 5 Software. This software already includes 4 preinstalled themes (You can download their trial software from their website). Your job is to redesign and tweak the existing theme plus add the following features: - Dropdown navigation Menu - Image popup when mouse over for products - More powerful zoom features on product detail page - and more So basically you don't design the site theme from scratch, but tweak from an existing theme.