Javascript Blocking right clicking

Below is the code to protect your page's contect from being copied...

<script language=javascript>

 var message = "function 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;
</script>