You can have multiple stores as text links, but only one image per signature is possible.
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If you're still struggling, maybe try looking at my instructions here http://www.bykimbo.com/ebid/help/addingsig.htm - sometimes a look from a different angle helps you see what you've done wrong!
That seems to have done it, I'd uploaded the banner but not inserted it.
Thanks for the information. Will need it I am sure. very Helpful to know.