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

function changeImagesArray(array) 
{
 if (document.images && (preloadFlag == true)) 
 {
  for (var i=0; i<array.length; i+=2) 
 {
   document[array[i]].src = array[i+1];
  }
 }
}

function changeImages() 
{
 changeImagesArray(changeImages.arguments);
}

function toggleImages() 
{
 for (var i=0; i<toggleImages.arguments.length; i+=2) 
 {
  if (selected == toggleImages.arguments[i])      changeImagesArray(toggleImages.arguments[i+1]);
 }
}

var selected = '';
var preloadFlag = false;
function preloadImages() 
{
 if (document.images) 
 {
  a_01_over = newImage("images/a_01-over.gif");
  preloadFlag = true;
 }
}

function pokaz_obr(id)
{
 adres = "php/obrazek_pow.php?id="+id;
 ob=window.open(adres,'','toolbar=no,scrollbars=yes');
 ob.moveTo(0,0);
 ob.resizeTo(screen.availWidth,screen.availHeight);
}