function openDisclaimer() {
  controlWindow=window.open("./disclaimer.html","Control","toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,width=400,height=300,resize=yes");
  }

function preLoadImages() {

  startseite= new Image();
  startseite.src = "/include/gfx/startseite.gif";
  startseiteon = new Image();
  startseiteon.src = "/include/gfx/startseiteon.gif";

  biografie= new Image();
  biografie.src = "/include/gfx/biografie.gif";
  biografieon = new Image();
  biografieon.src = "/include/gfx/biografieon.gif";

  books= new Image();
  books.src = "/include/gfx/books.gif";
  bookson = new Image();
  bookson.src = "/include/gfx/bookson.gif";

  lesungen= new Image();
  lesungen.src = "/include/gfx/lesungen.gif";
  lesungenon = new Image();
  lesungenon.src = "/include/gfx/lesungenon.gif";

  gastebuch= new Image();
  gastebuch.src = "/include/gfx/gastebuch.gif";
  gastebuchon = new Image();
  gastebuchon.src = "/include/gfx/gastebuchon.gif";

  kontakt= new Image();
  kontakt.src = "/include/gfx/kontakt.gif";
  kontakton = new Image();
  kontakton.src = "/include/gfx/kontakton.gif";
  }
  
function imageChange(imageID,imageName) {
  document.images[imageID].src = eval(imageName + ".src");
  }
function BookPicture(PictureNR,Side,Lang,w,h) {
  var myname = 'BookPicture';
  var mypage = '/include/images/picture.html?id=' + PictureNR + '&side=' + Side + '&lang=' + Lang;

  if(screen.width) {
    var winl = (screen.width-w)/2;
    var wint = (screen.height-h)/2;
    }
  else {
    winl = 0;
    wint = 0;
    }
  if (winl < 0) winl = 0;
  if (wint < 0) wint = 0;
  var settings = 'height=' + h + ',';
  settings += 'width=' + w + ',';
  settings += 'top=' + wint + ',';
  settings += 'left=' + winl + ',';
  win = window.open(mypage,myname,settings);
  win.window.focus();
  }