function navklein()
  {
//    document.getElementById('navigationID').style.clip = 'rect(0 675 80 0)';
//    document.getElementById('ansichtenID').style.zIndex = 150;
//    document.getElementsByTagName("div")[2].style.zIndex = 150;
    document.getElementsByTagName("div")[3].style.clip = 'rect(0 745 80 0)';
    document.getElementsByTagName("div")[1].style.zIndex = 120;
  }

 function navgross()
  {
//    document.getElementById('navigationID').style.clip = 'rect(0 675 80 0)';
//    document.getElementById('ansichtenID').style.zIndex = 150;
//    document.getElementsByTagName("div")[2].style.zIndex = 20;
//    document.getElementsByTagName("div")[3].style.zIndex = 20;
    document.getElementsByTagName("div")[3].style.clip = 'rect(0 745 190 0)';
    document.getElementsByTagName("div")[1].style.zIndex = 20;
  }