function landauswahlreg() {
  if(document.reg.land2.value != '') {
    document.reg.land.selectedIndex = 0;
    document.reg.land.disabled = true;
  } else {
    document.reg.land.disabled = false;
    document.reg.land.selectedIndex = vorselectposition;
  }
}
function landauswahlprofil() {
  if(document.profil.land2.value != '') {
    document.profil.land.selectedIndex = 0;
    document.profil.land.disabled = true;
  } else {
    document.profil.land.disabled = false;
    document.profil.land.selectedIndex = vorselectposition;
  }
}
function passwortcheckbox(checkbox, formelement1, formelement2, formelement3) {
  if(checkbox.checked==true){
    formelement1.disabled = false;
    formelement2.disabled = false;
    formelement3.disabled = false;
  }
  else {
    formelement1.disabled = true;
    formelement2.disabled = true;
    formelement3.disabled = true;
  }
}