Paymon if your intent is to set up all 4 cams and stream from all 4 at the same time, you may be interested in our Miricam program at
http://2Much.net/miricam/index.php.
It will let you broadcast all 4 streams at the same time, on the same page, in a video-wall style format, giving your customers views of all 4 cams at the same time. It will also let her customers broadcast their videos back to her. It includes a chat window, and can be customized with your own logos, banners, etc, and use your existing username / password management if you have one.
Contact me to discuss if you're interested.