function at() {
  var url= window.location.href;
  if(url.charAt(url.length- 1)== '/') { url= url.substring(0, url.length- 1); }
  url= url+ '/';
  var s= url.indexOf("//")+ 2;
  var e= url.indexOf("@");
  if(e > 0) {
    var atpart= url.substring(s, e);
    window.location.href= url+ atpart + '/';
  }
}

function oeffnen(url)  {
                Second_win = window.open(url,"Zweites","scrollbars=yes,width=700,height=500,resizable=yes");
                  }

 function schliessen()  {
                window.self.close();
                  }

 function ffwtop(){
                   if(top.location.href == self.location.href){
                          top.location.href = "../ffw/index.html";
                              }
                   }