Okay, basically what you will be creating here is the Archive portion of this website. This will be a pop-up window and will have a distinctive design from the main site while still using the main template design elements so it doesn't look too different.
The archive will function as a separate part of the site with its own search/results functions as well as an article page that will show the actual content so keep this in mind when designing it.
I have attached a zip with 3 files, one basic mockup of the archive, once basic mockup of another section of the site as well as the psd of that section so you can pull design elements from it quickly. The reason I included the mockup and final design of the other section was to show how we used the basic idea the client had and took the good elements while ditching the stuff that didn't work. Feel free to do the same with this archive page.