function next_image()
{
  if (!is_next) { return false; }
  current_image++;
  is_next = (small_images.length > current_image + 1);
  is_previous = (current_image > 1);
  fade_out('image');
  window.setTimeout('load_image()', 800);
}
function previous_image()
{
  if (!is_previous) { return false; }
  current_image--;
  is_next = (small_images.length > current_image + 1);
  is_previous = (current_image > 1);
  fade_out('image');
  window.setTimeout('load_image()', 800);
}

function load_image()
{  
  ret = '<img src="' + root + 'images/' + small_images[current_image] + '" alt="" class="thumbnail">';
  if (big_images[current_image]) { ret = '<a href="' + root + 'images/' + big_images[current_image] + '" target="_blank">' + ret + '</a>'; }
  document.getElementById('image').innerHTML = ret;
  fade_in('image');
  
  if (is_next) { document.getElementById('next_image').innerHTML = '<a href="#" onclick="next_image();return false;"><img src="' + root + 'images/next.gif" alt="Következ&#245; kép" /></a>'; }
  else { document.getElementById('next_image').innerHTML = '&nbsp;'; }
  if (is_previous) { document.getElementById('previous_image').innerHTML = '<a href="#" onclick="previous_image();return false;"><img src="' + root + 'images/previous.gif" alt="El&#245;z&#245; kép" /></a>'; }
  else { document.getElementById('previous_image').innerHTML = '&nbsp;'; }
}