If you view the source code for that page, you’ll see that there are no references to any sort of image. It’s all done with colored <div> tags, instead. I originally made that in response to 8pla’s ‘ASCII Art’ offering in the Just For Fun thread, but I added a Mandelbrot fractal to the mix, to go with this thread.
![Directory](/design/header/tab_directory_off.png)
![Business](/design/header/tab_business_off.png)
![Research](/design/header/tab_research_off.png)
![Awards](/design/header/tab_awards_off.png)
![Community](/design/header/tab_community_off.png)
![Forums](/design/header/tab_forums_on.png)