var ErrMsg = "Oikean hiirennapin käyttö estetty";

function disableRightClick(btnClick)
{
if (navigator.appName == "Netscape" && btnClick.which == 3) // check for netscape and right click
{
alert(ErrMsg);
return false;
}
else if (navigator.appName =="Microsoft Internet Explorer" && event.button == 2) // for IE and Right Click
{
alert(ErrMsg);
return false;
}
}
document.onmousedown = disableRightClick;