http://www.yawcam.com
that will let you stream your webcam to a webpage
it has a built in page designer for "dummies"
theres plenty of free chat software to use to add a chatroom on the main page ( no point in using 4 chat rooms for 1 person )
prob no point in streaming all 4 cams either , just have thumbnails to the other cams, there is motion detection so you could just have the camera that detects motion be the "main cam"