if (document.captureEvents){
document.captureEvents(Event.MOUSEDOWN);
}
var message = "Sorry! You do not have the permission to perform this function!";
function preventRightClick(e){
if (document.all) {
	if (event.button == 2) alert(message);
	return false;
}
if (document.captureEvents) {
	if (e.which ==3) alert(message);
	return false;
}
}
document.onmousedown = preventRightClick;