$(document).ready(function() {
  
  var per_item_delay=8000; //msec
  var visible_items=5; // predpoklada se, ze vsechny boxy budou stejne vysoke
  var items_space=0; // mezera v px mezi boxama (soucet margin-top a margin-bottom)
  
  
  var items_total=$(".itemBelt .item").length;
  var duration_all = (items_total-visible_items) * per_item_delay;
  var belt_height = $(".itemBelt").height();
  var belt_item_height = $(".itemBelt .item").height();
  
  var scroll_height=belt_height-visible_items*belt_item_height-items_space*visible_items;
  //alert(belt_item_height);
  
  if(items_total > visible_items) scroll_aside_banner();
  
  function scroll_aside_banner()
  {
    $(".itemBelt").css("top",0);
    $(".itemBelt").animate({top: -scroll_height},duration_all,"linear",function(){scroll_aside_banner();});
  }
  
 

});