function changeImage( imgNumber, isOn ) {
  if ( isOn == 1 ) {
    window.document.images[imgNumber].src = sunny.src;
  }
  else {
    window.document.images[imgNumber].src = hidden.src
  }
}

function dblChange( imgNumber, isOn ) {
  changeImage( imgNumber, isOn );
  changeImage( imgNumber + 1, isOn );
}

function popUp( ziel, titel, breite, hoehe ) {
  if (screen.availWidth <= breite || screen.availHeight <= hoehe) {
    links = 1;
    oben = 1;
  }
  else {
    links = (screen.availWidth - breite) / 2;
    oben = (screen.availHeight - hoehe) / 2;
  }
  var fenster = window.open(''+ziel+'',''+titel+'','scrollbars=0,toolbar=0,resizable=0,width='+breite+',height='+hoehe+',left='+links+',top='+oben+'');
  fenster.moveTo( links, oben );
  fenster.focus();
}

function initStatus() {
  window.status = "Ferien in Jabel bei Familie Diller";
  return true;
}

function clickStatus() {
  window.status = "Zum Vergr&ouml;&szlig;ern klicken";
  return true;
}

function defaultStatus() {
  window.status = "Ferien in Jabel bei Familie Diller";
  return true;
}

function initBullets() {

  initStatus();

  hidden = new Image();
  hidden.src = "images/bultra.gif";

  sunny = new Image();
  sunny.src = "images/bulsun.gif";
}