Forbid Right Click, Help! Options

[lpdrummer]

When I put this

var message="rawr.";
function click(e) {
if (document.all) {
if (event.button==2||event.button==3) {
alert(message);
return false;
}
}
if (document.layers) {
if (e.which == 3) {
alert(message);
return false;
}
}
}
if (document.layers) {
document.captureEvents(Event.MOUSEDOWN);
}
document.onmousedown=click;
// -->

In my header, it just puts the code on my site. But before it prevented people from right clicking! I took it off for a sec to save a picture, and when I put it back on, it stopped working! Help!