Bloqueo boon derecho

<script language="Javascript"> var msg="¡El botón derecho está desactivado para este sitio !";function disableIE() {if (document.all) {alert(msg);return false;}} function disableNS(e) {if (document.layers||(document.getElementById&&!document.all)) {if (e.which==2||e.which==3) {alert(msg);return false;}}}if (document.layers) {document.captureEvents(Event.MOUSEDOWN);document.onmousedown=disableNS;} else {document.onmouseup=disableNS;document.oncontextmenu=disableIE;} document.oncontextmenu=new Function("alert(msg);return false")</script>

<script language="Javascript">
< -- Begin
document.oncontextmenu = function(){return false}
// End -->
</script>

<script language="Javascript">
document.oncontextmenu = function(){return false}
</script>