function ladenavigation()
 {
   var anzahl_ul = document.getElementsByTagName("ul").length;
   
   for (var i = 0; i < anzahl_ul; i++)
    {
     if (document.getElementsByTagName("ul")[i].id != "")
      {
        document.getElementsByTagName("ul")[i].style.display = 'none';
      }
    }
   
 }

function oeffnenavigation(id, id2)
 {
   if (document.getElementById(id).style.display == 'block'){
    document.getElementById(id).style.display = 'none';
    document.getElementById(id2).style.backgroundColor = '#FFCC00';
   }else{
    document.getElementById(id).style.display = 'block';
    document.getElementById(id2).style.backgroundColor = '#FFFF99';
   }
 }
 
 function marknavi(id){
    document.getElementById(id).style.backgroundColor = '#FFFF99';
 }
 
 function switchOn($id)
{
 	document.getElementById($id).src="./images/site/basketball.gif";
}

 function switchOff($id)
{
 	document.getElementById($id).src="./images/site/basketball_transparent.gif";
}