function click (e)
{
	if (!e)
   		e = window.event;
  	if ((e.type && e.type == "contextmenu") || (e.button && e.button == 2) || (e.which && e.which == 3))
  	{
	    if (window.opera)
	    	window.alert("Diese Funktion ist deaktiviert.");
	    return false;
  	}
}
if (document.layers)
	document.captureEvents(Event.MOUSEDOWN);
	document.onmousedown = click;
	document.oncontextmenu = click;