var px = 1; //mehr=schneller
  var timer;
  function scrollDenDiv(val){
    clearTimeout(timer);
    d = document.getElementById('content')
    y = d.scrollTop;
    if(val==1)y -= px;
    if(val==2)y += px;
    if(y <= d.scrollHeight-d.offsetHeight+px&&y >= 0-px){
      d.scrollTop = y;
      timer=setTimeout('scrollDenDiv('+val+')',5);
    }
    if(y<0||y>d.scrollHeight-d.offsetHeight){
      clearTimeout(timer);
    }
  }