function click(evt) {
  if (navigator.appName.indexOf("Microsoft") != -1){
    if (event.button==2) {
       alert('Kopierschutz! Copyright by www.hofzupriel.at (c)!');
       return false
    };
  };
  if (navigator.appName.indexOf("Netscape") != -1) {
    if ( evt.which == 3 ) {
       alert('Kopierschutz! Copyright by www.hofzupriel.at (c)!');
	return false
    };
  };
};
if (navigator.appName.indexOf("Netscape") != -1) {
   document.captureEvents( Event.MOUSEDOWN )
};
document.onmousedown = click;