var message = "Right-Click is disabled.";
   function rtclickcheck(keyp){ if (navigator.appName == "Netscape" && keyp.which == 3){  alert(message); return false; }
   if (navigator.appVersion.indexOf("MSIE") != -1 && event.button == 2) {  alert(message);   return false; } }
   document.onmousedown = rtclickcheck;