Yes, for sure make that an image. For one it is repeated through the page, so the page will only load one image and for another it is only a small amount of text.
I don't know how good you are with fireworks, but it is a superb piece of kit. Be aware of these things for image optimisation:
1) Make sure the image ends up the size that you need when it leaves fireworks, never, ever allow a browser or dreamweaver to resize any images
2) Go through the "export preview" and tweak your settings (especially number of colours) until the file is as small in byte size as possible without losing too much quality
3) If it is flat blocks of colour, use GIF, for blends and photo type images use JPG
Good luck. Derren
[Mediocre talent - spread really thin]