//Hide the given div
function hidediv(divId) { 
  if (document.getElementById(divId) != null)
  {
    document.getElementById(divId).style.display = 'none'; 
  }
}

//Show the given div
function showdiv(divId) { 
  if (document.getElementById(divId) != null)
  {
    document.getElementById(divId).style.display = 'block'; 
  }
}

//Show the given div
function showhidediv(divId1,divId2) { 
  if (document.getElementById(divId1) != null && document.getElementById(divId2) != null)
  {
    document.getElementById(divId1).style.display = 'block'; 
    document.getElementById(divId2).style.display = 'none'; 
  }

} 

function checkPLZFinder() {
 var myForm = document.forms[0];
 if (myForm.plz.value=="") {
    alert("PLZ ist leer");
    return;
 }
 else {
 	myForm.submit();
 }
}