var message="Copyright (c) Mathilde Crouzet";

function clickIE() {
    if (document.all) {
        alert(message);
        return false;
    }
}

function clickNS(e) {
    if (document.layers||(document.getElementById&&!document.all)) {
        if (e.which==2||e.which==3) {
            alert(message);
            return false;
        }
    }
}

if (document.layers) {
    document.captureEvents(Event.MOUSEDOWN);
    document.onmousedown=clickNS;
}
else {
    document.onmouseup=clickNS;
    document.oncontextmenu=clickIE;
}

document.oncontextmenu=new Function("alert(message);return false");