Disable right click on web page

This snippet will prevent the viewer from being able to right-click on your page. 

<script type="text/javascript">

function f1() {
  if(document.all) { return false; }
}

function f2(e) {
  if(document.layers || (document.getElementById &! document.all)) {
    if(e.which==2 || e.which==3) { return false; }
  }
}

if(document.layers) {
  document.captureEvents(Event.MOUSEDOWN);
  document.onmousedown = f1;
}
else {
  document.onmouseup = f2;
  document.oncontextmenu = f1;
}

document.oncontextmenu = new function("return false");
</script>