Image size too big

Hi there,
I have a question about the covers images or screenshots of somes games like Averno or The Wall. Because they are very big, is there a system to fit in the user's window without having to scrolling through the image?

I've checked it with IE and Firefox. In other web pages with images, if clicking in a big image it resize correctly, I supose it exists various windows popups methods.

Regards.

hi...