This is great when you want to disable the all mighty powerful right mouse button to prevent surfers from saving images, graphics, text, etc. off your page.
<script language="Javascript">
function click()
{ if (event.button==2) {
alert('Due to link, graphic, and HTML code stealers, this option is not
available to you :-(');
}
}
document.onmousedown=click // -->
</script>