It's a very simple line of code:
document.getElementsByClassName("header-2014 clearfix")[0].backgroundColor = "#FF0000"
I'm trying to use it here:
http://www.roblox.com/Chess-place?id=95041893
I'm using the JavaScript console (could that have anything to do with it?)
I'm expecting a very simple answer, so help would be appreciated, it's probably just some simple syntax error that a newbie to JavaScript (like me) would have.