<script language="JavaScript1.2" type="text/javascript">
  <!-- Disable Right Mouse Button - NS & IE 4.0 & later; degrades gracefully -->
am = "This function is disabled!";

bV  = parseInt(navigator.appVersion)
bNS = navigator.appName=="Netscape"
bIE = navigator.appName=="Microsoft Internet Explorer"
function nrc(e) {
   if (bNS && e.which > 1){
      alert(am)
      return false
   } else if (bIE && (event.button >1)) {
     alert(am)
     return false;
   }
}
document.onmousedown = nrc;
if (document.layers) window.captureEvents(Event.MOUSEDOWN);
if (bNS && bV<5) window.onmousedown = nrc;
</script>