Buzzing coming from my LCD

[batteriesnotincluded]

When I visit certain webpages, I'll get a high pitched buzzing sound from my LCD. If I scroll down or up to a place where it shows different colors, or more of one color or the other, it tends to go away.

Any thoughts on what this could be? I know my LCD is under warranty until 2011..but I don't really want to tempt fate as I've got no bad pixels or anything.