OScommerce small simple project

Simple small project I need done as soon as possible on an oscommerce store. This is what I need. There are two main categories in the shop. Each has sub-categories underneath. The logo in the top header needs to change between 2 different images based on the category the customer is in. For example: let's the 2 main categories are: 1. Widgets 2. Baskets If the customer is in the "Widgets" category or any sub-categories of this parent category then the header will display [login to view URL] If the customer is in the "Baskets" category or any sub-categories of this parent category then the header will display [login to view URL] If the customer is in neither category (such as [login to view URL] or [login to view URL] or any of the files that don't display products) then it will default to logo1.jpg. I have heavily modified the store so whoever works on this will have to work directly on the store. Check my feedback. I pay on time. My budget for this is $30