// array of images 
  var imgs = new Array(10); 
    imgs[0] = "./img/navi/etusivu.jpg"; 
    imgs[1] = "./img/navi/etusivu_h.jpg";
	imgs[2] = "./img/navi/henkilokunta.jpg";
	imgs[3] = "./img/navi/henkilokunta_h.jpg";
	imgs[4] = "./img/navi/hinnasto.jpg";
	imgs[5] = "./img/navi/hinnasto_h.jpg";
	imgs[6] = "./img/navi/yhteystiedot.jpg";
	imgs[7] = "./img/navi/yhteystiedot_h.jpg";
	imgs[8] = "./img/etime.jpg";
	imgs[9] = "./img/etime_hover.jpg";
     
  
  // preload the images 
  function preload() { 
   var tmp = null; 
   for (var j = 0; j < imgs.length; j++) { 
     tmp = imgs[j]; 
     imgs[j] = new Image(); 
     imgs[j].src = tmp; 
   } 
  } 
  void(preload()); 
    
  // swap images 
  function imgSwap(img, swap) { 
   img.src = imgs[swap].src; 
  }