You should disable Java in your browser. Now.

Here's how.

Here's why. More here and here.

I'll add that I have not had Java running in my main browser since forever, and I can't think of any site I care about that's hampered by this absence. So, do it. It'll take you one minute (unless you're an IE user, in which case, here's yet another reason to switch!), and you'll be measurably safer.