var message = "function disabled"; 
function rtclickcheck(keyp){
	if (navigator.appName == "Netscape" && keyp.which == 3){ 
		alert(message); return false; 
	} 
	if (navigator.appVersion.indexOf("MSIE") != -1 && event.button == 2) {
		alert(message);
		return false;
	}
} 
document.onmousedown = rtclickcheck;