// array of images 
  var imgs = new Array(5); 
    imgs[0] = "../images/kezdolap_hover_btn.png";
    imgs[1] = "../images/szolgaltatasok_hover_btn.png";
    imgs[2] = "../images/referenciak_hover_btn.png";
	imgs[3] = "../images/partnerek_hover_btn.png";
	imgs[4] = "../images/kapcsolat_hover_btn.png";
  
  // 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; 
}