function changeImages()
 {
  if (document.images)
  {
   for (var i=0; i<changeImages.arguments.length; i+=2)
   {
    document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
   }
  }
 }

 var PreloadFlag = false;

 function newImage(arg)
 {
  if (document.images)
  {
   rslt = new Image();
   rslt.src = arg;
   return rslt;
  }
 }

 function PreloadImages()
 {
  if (document.images)
  {
	// preload all rollover images
	img1 = newImage('../images/meniu/btn1over.jpg');
	img2 = newImage('../images/meniu/btn2over.jpg');
	img3 = newImage('../images/meniu/btn3over.jpg');
	img4 = newImage('../images/meniu/btn4over.jpg');
	img5 = newImage('../images/meniu/btn5over.jpg');
	PreloadFlag = true;
  }
  return true;
 }