Banner designer for ecommerce site

Looking to have someone on board who understands the importance of grabbing the attention of the customer on an ecommerce site, and to promote products and increase sales by adding relavant information that is going to make them click on this link, and go further into your site, via new interesting banners, promotional banners with catchy slogans, and other ideas to showcase & promote using static or flash banners to highlight various new things happening with the site.