function hide(div) {
  
    if (document.getElementById("ueber").style.display == "" && div != "ueber")
      document.getElementById("ueber").style.display = "none";
    else if (document.getElementById("ayurveda").style.display == "" && div != "ayurveda")
      document.getElementById("ayurveda").style.display = "none";
    else if (document.getElementById("spezial").style.display == "" && div != "spezial")
      document.getElementById("spezial").style.display = "none";
    else if (document.getElementById("verwoehn").style.display == "" && div != "verwoehn")
      document.getElementById("verwoehn").style.display = "none";
    else if (document.getElementById("koerper").style.display == "" && div != "koerper")
      document.getElementById("koerper").style.display = "none";
    else if (document.getElementById("kosmetik").style.display == "" && div != "kosmetik")
      document.getElementById("kosmetik").style.display = "none";
    else if (document.getElementById("kurse").style.display == "" && div != "kurse")
      document.getElementById("kurse").style.display = "none";
    else if (document.getElementById("akademie").style.display == "" && div != "akademie")
      document.getElementById("akademie").style.display = "none";
  
    if (document.getElementById(div).style.display != "")
      document.getElementById(div).style.display = "";
    else
      document.getElementById(div).style.display = "none";
  }