am = "Copyright © Hayes Engineering Services Ltd 2007";
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)) {
   		if (event.srcElement.id == "no_rc") {
     		alert(am);
     	    return false;
     	}
   }
}

document.onmousedown = nrc;
if (document.layers) window.captureEvents(Event.MOUSEDOWN);
if (bNS && bV<5) window.onmousedown = nrc;