Hi folks. We would like to set up web-based video conferencing. Our IS dept will not change our firewall to allow conventional videoconferencing. Is there an software that allows just port 80 to be open? Can Windows Messenger or Microsoft Netmeeting be configured to work on port 80?

The features we would like:
- audio
- video
- sharing of an application such as the agenda for the meeting
- sharing of a whiteboard