(Works with IE & Netscape)
This web page shows how to catch a onMouseDown() event and disable the right click ability. This way the client cannot right click and the choose "View Source".
When looking at the source pay attention to the differences in IE vs Netscape. IE uses the <body> tag events and netscape uses the window.captureEvent(). I've shared the fOnMouseDown() function, however the properties used are different.