var message="This page is protected by Copyright!";

isIE=document.all;
isNN=!document.all&&document.getElementById;
isN4=document.layers;

if (isIE||isNN) {
document.oncontextmenu=block;
}else{
document.captureEvents(Event.MOUSEDOWN || Event.MOUSEUP);
document.onmousedown=block;
}

function block(e) {
if (isN4) {
if (e.which==2||e.which==3) {
alert(message);
return false;}
}
else {
alert(message);
return false;}
}