var is_animating = 0;

function scrollDiv(kier, that) {

   if(is_animating) return;

   is_animating = 1;
  
   elem =$(that).siblings('.festbox-scroll-fixed').find('.festbox-scroll-center');
   newpos = eval(' ' + new String(elem.position().top) + ' + ' +  new String((kier=='top')?'23':'-23') + ' ');
   if(newpos>0 || newpos< 23*3 - elem.height()) {
      is_animating = 0;
      return
   }

   elem.animate( {
      top: newpos
   }, 100, "linear", function(){
      is_animating = 0;
   });
}