function wechseln(id) {

 if(document.getElementById(id).className == "out")
  document.getElementById(id).className = "over";
 else
  document.getElementById(id).className = "out";

}

function ShowHide(id) {
  obj = document.getElementsById("div");
  if (obj[id].style.visibility == 'visible'){
      obj[id].style.visibility = 'hidden';
  }
  else {
      obj[id].style.visibility = 'visible';
  }
}

function show(id) {
  document.getElementById(id).style.visibility = 'visible';
}

function hide(id) {
  document.getElementById(id).style.visibility = 'hidden';
}