I need to create a banner's placeholder that needs to scroll up together with a page until it reaches a browser's top edge and then it should be fixed at the top. When the page is scrolled down, the banner also needs to scroll with the page again. I'm not sure whether I'm clear enough so you can see the example at Watch Critic. You'll notice that the banner in the right column behaves just like I've described.
I don't have experience with JavaScript so can this be achieved with HTML and CSS only?