Like ehBeth said, say hi.
See, here's the thing, particularly when both people are shy. Somebody has to step up to the plate and get things started. Since you know you like him, but you have no idea what his feelings are for you (if any), then you have to be the one to get things going.
You may fail.
This will not cause the world to end. You will not die of embarrassment.
And every time you take the initiative and try something new and break out of your comfort zone, it will be easier for you to do that later. This is a skill, and now is a good time for you to start learning it, regardless of what happens with this guy.
Go get 'em, Tiger.