function switchlayer(Layer_Name)
{

  var GECKO = document.getElementById? 1:0 ;
  var IE = document.all? 1:0 ;
  openLayer = Layer_Name;

  open_close = new Array('d1','d2','d3','d4', 'd5','d6', 'd7', 'd8');//Array mit ids von Untermenus
  left_current = new Array('c1'); //Array mit ids von Menupunkten ohne Untermenu
  if (GECKO)
      {     
          for( var i=0; i<open_close.length; i++ )
          {
            if (open_close[i]!=Layer_Name)
                {
                    var obj = document.getElementById(open_close[i]);
                    obj.style.display = "none";
                    obj.parentNode.className="";
                }
           }
           for( var i2=0; i2<left_current.length; i2++)
               {
                   document.getElementById(left_current[i2]).className="";
               }
           document.getElementById(Layer_Name).style.display=
	   (document.getElementById(Layer_Name).style.display=='block') ? 'none' : 'block';
           document.getElementById(Layer_Name).parentNode.className="current";
       }
  else if (IE)
       {
           for( var k=0; k<open_close.length; k++ )
          {
            if (open_close[k]!=Layer_Name)
                {
                    var obj3 = document.all[open_close[k]];
                    obj3.style.display = "none";
                    obj3.parentNode.className="";
                }
           }
           for( var k2=0; k2<left_current.length; k2++)
               {
                   document.all[left_current[k2]].className="";
               }
           document.all[Layer_Name].style.display = 'block';
           document.all[Layer_Name].parentNode.className="current";
       }
}