How about setting up a schedule for yourself. As an example...8-10 work, take a break and surf for 15 minutes, back to work till lunch. Surf on lunch then back to work until 3, break and surf...then finish working. Gives you something to look forward to while at the same time, gives you reason to be more productive on the job! Not only that, if you aren't careful, you could loose your job for lack of productivity and waisting the companies time online. They really frown on that in most places.

Good luck to you!