You have clicked on the link rather than moused over the image. Please go back to the previous page and if your browser is JavaScript-enabled then when you mouse over the russellboyle.com image it will roll-into a second russellboyle.com image. When you move your mouse off this new image the first picture will reappear. The JavaScript that creates this effect is the subject of one of the exercises in russellboyle.com's JavaScript for Beginners.