function clearArrows() {
    for(i = 5; i < 9; i++) {
      if(document.images[i].src != "images/tom.gif")
        document.images[i].src = "images/tom.gif";
    }
  }

  function swapIt(number) {
    clearArrows();
    document.images[4 + number].src = "images/pil.gif";
  }
  
  function MM_preloadImages() { //v3.0
    var d=document;
    
    if(d.images){
      if(!d.MM_p)
        d.MM_p=new Array();
      var i,j=d.MM_p.length,a=MM_preloadImages.arguments;
      for(i=0; i<a.length; i++)
        if (a[i].indexOf("#")!=0) {
          d.MM_p[j]=new Image;
          d.MM_p[j++].src=a[i];
        }
    }
  }