I think a good place to start is to describe one of my favorite tools.  It’s called Firebug, it’s an add-on for Mozilla browsers.

At work, if one of my co-workers comes to me in the J-Block and asks a Javascript or CSS question, before I even consider helping them I ask if they reviewed the styles or the Javascript in Firebug.  9 times out 10 if it’s a really easy answer, you’ll see it almost immediately with the help of Firebug. Read more »