We are looking for a means (a tool, a commercial service) to enable a closed user group to start a live video conference in a browser, as part of the company website. Something like Skype, but embedded and available for everybody that has access to the page into which the tool is embedded.

Most services require registration and the creation of a chat room on their website, or, as Skype or similar solutions, the installation of an extra software. What we need is a solution with some kind of a "hidden login", performed by the site's client script (which knows who the user is and forwards the credentials to the service).

Any suggestion?