Try opening your browser and in settings clear the history and cache and closing the browser completely. Then restart your computer. After this try the site again and see if it works.
using fire fox and I see what OP is talking about , thing is its the same color as the back round. the only time I see it when scrolling over a picture. if you go on the front page and mouse wheel scroll up and down u can see it when it passes over the shark. or at least I can.