I know how to include basic hyperlinks, and usually I think that's all I want. But sometimes I'd like to include an actual graph, especially if much of my answer text relates to that graph.
Edit 27/10/2013: For the past couple of years I'd been getting along fine with IE8 (and subsequently, Google Chrome) under XP using the method outlined in my own answer below. But something's changed recently with Google NGrams charts, and neither my method nor any other approaches on this page seem to work now.
Maybe I'm no longer a total noob at this sort of thing, but I still need help!