http://www.mywebstuff.com/01_dhtml/bit_01.html

x le coordinate del mouse e dove uno clicca

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codice:
<script language="JavaScript">
function destro(ev) {
 if (navigator.appName == 'Netscape' && (ev.which = 3 || ev.which == 2)) {
  alert("nn si clicca!");
  return false
 }
 else {
  if (navigator.appName == 'Microsoft Internet Explorer' && (event.button == 2 || event.button == 3)) {
   alert("nn si clicca!");
   }
  return false
 }
return true
}

document.onmousedown=destro
if (document.layers) {
 window.captureEvents(Event.MOUSEDOWN);
 window.onmousedown=destro
}

</script>
x disabilitare pulsante destro