  //pocztek skryptu
  function slideDiv(prevItem, currItem)
  {
    if(!advBox || !divs) return;

    var currDiv = divs[currItem];
    var prevDiv = divs[prevItem];

    biecyKrok += krok;
    
    if(biecyKrok > 1) biecyKrok = 1;
    currDiv.style.opacity = biecyKrok.toFixed(2);
    currDiv.style.filter = "alpha(opacity:" + 
      (biecyKrok * 100).toFixed(0) + ")";
    if(biecyKrok != 1){
      setTimeout("slideDiv(prevItem, currItem);", speed);
    }
    else{
      biecyKrok = 0;
      setTimeout("startShow();", timeout * 1000);
    }
  }
</script>