I just now sent a web page to someone at the office, and typed some descriptive text in the message body.
I've got javascript turned off for mail and news. When I displayed the message in my inbox, the text that I had typed was hidden by items from the html page. A small screen shot is available at http://www.wimsworld.com/~wbonner/.mozilla/mozillamailproblem.png with the text of the offending email at http://www.wimsworld.com/~wbonner/.mozilla/mozillamailproblem.txt I've hidden the other recipients addresses, but the rest of the message is exactly as the demo problem. This message displays correctly in netscape 4.6, so I don't think that it was built wrong. *Wim*.
