When you start a new image, in the "new image" dialoge box, check the "Transparent" box and that will give you a transparent background. When you go to publish it, make sure you publish as a ".gif" (I think ".png" also alows transparency but is much larger in file size and not widely used) so you can carry the transparency to you're optimised image.
Another thing is, if you have already started you're image and don't want to start again then just delete you're current background (so long as you have nothing important on it) and that should give you what you want.
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