<!-- from: http://javascript.internet.com -->

function right(e) {
    var msg = "(C) Bellebien";
    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;
        }
    }
}