img1 = new Image();  img1.src = "images/header3.gif";
img1h = new Image(); img1h.src = "images/header3a.gif";
img2 = new Image();  img2.src = "images/header4.gif";
img2h = new Image(); img2h.src = "images/header4a.gif";
img3 = new Image();  img3.src = "images/header5.gif";
img3h = new Image(); img3h.src = "images/header5a.gif";

function swap(img_num,img_obj){ window.document.images[img_num].src = img_obj.src; }

var message = "© 2002-2007 Kampagne für Gutes Bier\nDesign by StormConsult IT GmbH";

function rtclickcheck(keyp){
  if (navigator.appName == "Netscape" && keyp.which == 3) {
    alert(message);
    return false;
  }

  if (navigator.appVersion.indexOf("MSIE") != -1 && event.button == 2) {
    alert(message);
    return false;
  }
}

document.onmousedown = rtclickcheck