function setVisibility() {
var val=document.formular.control.selectedIndex;
if(val){
    if(val==0 || val == 1 || val == 2 || val == 3 || val == 4 || val == 5 || val == 7 || val == 8 ){
        document.getElementById("meinLayer").style.display = 'none';
        document.getElementById("meinLayer2").style.display = 'none';
    }
    if(val == 6){
       document.getElementById("meinLayer").style.display = 'block';
       document.getElementById("meinLayer2").style.display = 'block';
    }

} else {
    document.getElementById("meinLayer").style.display = 'none';
    document.getElementById("meinLayer2").style.display = 'none';
}

}


function changeDisplay(bMakeVisible, sId){
obj = document.getElementById(sId);
                 
if (obj != null){
    obj.style.display = (bMakeVisible) ? 'block' : 'none';
    return true;
}else
    return false;
}

function zaehlen() {
 max = 1000;

 anz = document.getElementById("areal").value.length+1;
 document.getElementById("zanzeige").value = max -anz; 

 if(anz >= max){
  alert("Maximum erreicht !!!");
 }
}