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Make sure you have border=0 as an attribute of the gif. It's probably drawing a border around it. Make sure it's truly invisible. If so, if you change the colour of the background, it will change colour to match.
lyndsey -dot- amott -at- docsymmetry -dot- com wrote
I created a transparent gif to
use as a pixel shim. The problem is that it is visible on my web page--it
looks like a depressed button. How can I make it truly invisible?