Change Style Sheet on webprogram

We have the source for a program written in asp.net and C#. We have changed some of the design on the pages. There are several features like video recorder and our Live Video Connector which we do with a hyperlink to another page so no programming for this, just a place holder for it. We have done the pages we want to change in psd's. All of the pages would require our header and footer as well, even if there is no changes to the page. The person we're looking for would need to convert the pages to the new style into the existing code. The functionality isn't changing. The attached document has the website where you can see the website. We will provide you with the source code. We need this project as soon as possible.