var AktReiterAnzeige = 'lastm_p';

function SwitchReiter(AktReiter) {
if (AktReiter == 'lastm_p') {
        document.getElementById(AktReiter).src = "gfx/top_offers/lastm_on.jpg";
        document.getElementById('flug').src = "gfx/top_offers/flug_off.jpg";
        document.getElementById('hotel').src = "gfx/top_offers/hotel_off.jpg";

        AktReiterAnzeige = AktReiter;
}
else if (AktReiter == 'flug') {
        document.getElementById(AktReiter).src = "gfx/top_offers/flug_on.jpg";
        document.getElementById('lastm_p').src = "gfx/top_offers/lastm_off.jpg";
        document.getElementById('hotel').src = "gfx/top_offers/hotel_off.jpg";

        AktReiterAnzeige = AktReiter;
}
else if (AktReiter == 'hotel') {
        document.getElementById(AktReiter).src = "gfx/top_offers/hotel_on.jpg";
        document.getElementById('lastm_p').src = "gfx/top_offers/lastm_off.jpg";
        document.getElementById('flug').src = "gfx/top_offers/flug_off.jpg";
        AktReiterAnzeige = AktReiter;
}
}

function checkZimmer(id) {
  
  var room1 = document.getElementById('zimmer1');
  var room2 = document.getElementById('zimmer2');

  if (id == 'zimmer1') {
    if(room1.selectedIndex == 0)
      room2.disabled = false;
    else
      room2.disabled = true;
  }
  else {
    if(room2.selectedIndex == 0)
      room1.disabled = false;
    else
      room1.disabled = true;
  }
}