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There are few faces that are "cross-browser" friendly. Some of the sans-serif faces include Arial, Verdana and Helvetica. In order to make sure your viewer is even seeing close to what you want them to see, use several faces in your tags. Two examples (you would put the < > brackets on both ends):
font face="Arial, Helvetica, sans-serif"
font face="Verdana, Arial, sans-serif"