Right. Make sure the background is all ONE colour (ie, make sure there are not like 2 shades of white there).
Then, go to "File", "Save", and select "GIF".
Select "Options", "Run Optimiser".
In the first tab, select the LAST option and make sure that tolerance is set to "0". Then, click on your image in the background, on the bit you want to be transparent.
check all the other options as you want, then save the image!
Dave!!
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