I am having wonderful results using jpeg for all of my line graphics online. There is no hard and fast rule that you cannot use what brings the best result on internet. Stripping color tables on jpegs also reduces file size. A good stripped jpeg can be 3k which is pretty small. I would test all my images online and under various platforms and then decide. Flash is also a great format for line graphics but needs the Flash plug-in which most everyone has these days.
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