pictures of browsers

I suspect asking this question is a sign of paranoia.

If I'm doing some advertising that shows my web site, are there any rules about whether or not I can include the browser (e.g., IE or Netscape) in the picture?

I know it's done all the time, but I'm wondering whether it's base on permission. I don't see how the three major IP branches are involved. I'm not using their idea (patent), nor their specific code (copyright), and I don't think that anyone will think we're saying we are the source of the browser (trademark).

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Mark Kolber
Denver, Colorado
<mjkolber[_at_]usa.net>