// User agent
window.opera = navigator.userAgent.toLowerCase().indexOf("opera") > -1;

// Anti-Rightclick
// http://de.selfhtml.org/navigation/anzeige/rechte_maustaste.htm
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("Sorry: Diese Funktion ist deaktiviert.");
    return false;
  }
}
if (document.layers)
  document.captureEvents(Event.MOUSEDOWN);
document.onmousedown = click;
document.oncontextmenu = click;

// Anti-Drag
document.ondragstart = function() {
	return false;
}