function changeButton(id, image)
{
   document.getElementById(id).src = 'image/navi/' + image + '.png';
}

function changeSNButton(id, image)
{
   document.getElementById(id).src = 'image/subnavi/' + image + '.png';
}

function checkemail()
{
   var email = document.getElementById('newsletteremail').value;
   if(email == 'email@domain.de')
   {
      alert('Bitte geben Sie Ihre E-Mail-Adresse ein!');
      return false;
   }
}

function epLINK(address)
{
   document.location = "mailto:" + address.replace(/:/, "@"); 
}


function changeObergeschoss(id)
{
   document.getElementById('obergeschoss').src = 'image/lageplan/' + id + '.png';
}

function resetObergeschoss()
{
   document.getElementById('obergeschoss').src = 'image/lageplan/obergeschoss.png';
}


function changeUntergeschoss(id)
{
   document.getElementById('untergeschoss').src = 'image/lageplan/' + id + '.png';
}

function resetUntergeschoss()
{
   document.getElementById('untergeschoss').src = 'image/lageplan/untergeschoss.png';
}

function showSubnavi(id)
{
   /* alle Menüs zusammenklappen */
   document.getElementById('mnu_kino').style.display = 'none';
   document.getElementById('mnu_essen-trinken').style.display = 'none';
   document.getElementById('mnu_sport-spass').style.display = 'none';
   document.getElementById('mnu_party-event').style.display = 'none';
   document.getElementById('mnu_kids-co').style.display = 'none';
   document.getElementById('mnu_reisen').style.display = 'none';
   document.getElementById('mnu_info-services').style.display = 'none';
   document.getElementById('mnu_kontakt').style.display = 'none';

   /* gewähltes Menü ausklappen */
   document.getElementById('mnu_' + id).style.display = 'block';
   
   
   /* alle Hauptnavi-Punkt-Biler resetten*/
   document.getElementById('btn2').src = 'image/navi/kino_off.png';
   document.getElementById('btn3').src = 'image/navi/essen_trinken_off.png';
   document.getElementById('btn4').src = 'image/navi/sport_spass_off.png';
   document.getElementById('btn5').src = 'image/navi/party_event_off.png';
   document.getElementById('btn6').src = 'image/navi/kids_co_off.png';
   document.getElementById('btn7').src = 'image/navi/reisen_off.png';
   document.getElementById('btn8').src = 'image/navi/info_services_off.png';
   document.getElementById('btn9').src = 'image/navi/kontakt_off.png';

   /* Hauptnavi-Punkt hervorheben */
   if(id == 'kino')              document.getElementById('btn2').src = 'image/navi/kino_on.png';
   if(id == 'essen-trinken')     document.getElementById('btn3').src = 'image/navi/essen_trinken_on.png';
   if(id == 'sport-spass')       document.getElementById('btn4').src = 'image/navi/sport_spass_on.png';
   if(id == 'party-event')       document.getElementById('btn5').src = 'image/navi/party_event_on.png';
   if(id == 'kids-co')           document.getElementById('btn6').src = 'image/navi/kids_co_on.png';
   if(id == 'reisen')            document.getElementById('btn7').src = 'image/navi/reisen_on.png';
   if(id == 'info-services')     document.getElementById('btn8').src = 'image/navi/info_services_on.png';
   if(id == 'kontakt')           document.getElementById('btn9').src = 'image/navi/kontakt_on.png';
}