function right(e) {
	var msg = "You cannot right-click on images on this page.";
	if (navigator.appName == 'Netscape' && e.which == 3) {
		alert(msg);
		return false;
		}

	if (navigator.appName == 'Microsoft Internet Explorer' && event.button==2) {
		alert(msg);
		return false;
		}
	else return true;
	}

function trap() {
	if(document.images) {
		for(i=0;i<document.images.length;i++) {
			document.images[i].onmousedown = right;
			document.images[i].onmouseup = right;
			}
		}
	}