function biero() {
  for (var n = 0; n < arguments.length; n++) {
    var a = arguments[n];
    var mode = a.substr(0, 1);
    if (mode != "+" && mode != "-") { //expliziter Zustand?
  	  var s = document.getElementById(a).style;
  	  s.display == 'none' ? s.display = 'block' : s.display = 'none';
    } else {
  	  o = a.substr(1, a.length);
  	  s = document.getElementById(o).style;
  	  mode == "-" ? s.display = 'none' : s.display = 'block';
    }
  }
}


function toggleDiv(id){
  if($(id).style.display == 'none'){
    $('arrow'+id).className = 'arrow_open';
    Effect.SlideDown($(id),{duration:0.3});
  }else{
    $('arrow'+id).className = 'arrow';
    Effect.SlideUp($(id),{duration:0.3});
  }
}