Alternatives to the canvas tag

I’m currently implementing a pure JavaScript time-series/line graph. I’ve got the idea from the book I’m currently reading (Visualizing Data by Ben Fry).

It works great, still have to do some improvements here and there but my main goal is to get it running with IE, which doesn’t support the <canvas> tag (which is really a pity).

Do you know any alternatives? It’s enough if I could draw basic shapes like rectangles and lines, nothing fancy.