function switchon(ebeneein, ebeneaus) {
         document.getElementById(ebeneaus).style.visibility = "hidden";
         document.getElementById(ebeneein).style.visibility = "visible";
}
function switchoff(ebeneaus) {
         document.getElementById(ebeneaus).style.visibility = "hidden";
}
function switchoneon(ebeneein) {
         document.getElementById(ebeneein).style.visibility = "visible";
}
function preloadImages() { 
  var d=document; if(d.images){ if(!d.p) d.p=new Array();
    var i,j=d.p.length,a=preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.p[j]=new Image; d.p[j++].src=a[i];}}
}