function switchbox1() {
  if(document.sucheform.branche.value=='Branche') {
    document.sucheform.branche.value='';
  } else if(document.sucheform.branche.value=='') {
    document.sucheform.branche.value='Branche';
  }
}

function switchbox2() {
  if(document.sucheform.ort.value=='PLZ/Ort') {
    document.sucheform.ort.value='';
  } else if(document.sucheform.ort.value=='') {
    document.sucheform.ort.value='PLZ/Ort';
  }
}