// This code is for IE
function nocontextmenu(){
	event.cancelBubble = true;
	event.returnValue = false;
return false; 
}
document.oncontextmenu = nocontextmenu;

// This code is for Netscape
var ns = (navigator.appName == "Netscape");

function rightClick(evnt){
if (ns && ((evnt.which == 2) || (evnt.which == 3)))
	return false;
else
	return true;
}

if (ns){
	window.captureEvents(Event.MOUSEDOWN);
	window.captureEvents(Event.MOUSEUP);
}

window.onmousedown = rightClick;
window.onmouseup = rightClick;