var message = "Sorry. Not in use";
function rightClick(e) {
	if(window.event) {
		if(window.event.button == 2) {
			alert(message);
			window.event.returnValue = false;
		}
	}else if(e){
		if(e.which && e.which == 3) {
			alert(message); return false;
		}
	}
}
function contextMenu(e) {
	if(window.event) {
		alert(message);
		window.event.returnValue = false;
	}else if(e){
		alert(message); return false;
	}
}
var ua = navigator.userAgent;
var idx = ua.indexOf("MSIE");
if((idx >= 0 && ua.substr(idx + 5, 1) >= 5) || ua.indexOf("Gecko") >= 0){
	document.oncontextmenu = contextMenu;
}else{
	document.onmousedown = rightClick;
}