Индикаторы загрузки сайта

<script type="text/javascript">
function hideLoading()
{
document.getElementById('pageIsLoading').style.display = 'none';
}
</script>

<div id="pageIsLoading" style="position:absolute;
  display:block;
  padding-left:44px;
  padding-right:12px;
  width:auto;
  height:46px;
  line-height:46px;
  border:1px solid #890000;
  color:#000000;
  font-weight:bold;
  background-color:#e5e5e5;
  background-image: url(http://www.путь_к_папке_images/имя_картинки.gif);
  background-position: 6px center;
  background-repeat: no-repeat;">
<script type="text/javascript">
if (typeof window_width == 'undefined' || typeof window_height == 'undefined')
  {
var window_width; var window_height;
if( typeof( window.innerWidth ) == 'number' )
  {  
window_width = window.innerWidth; window_height = window.innerHeight;
}
  else
if(document.documentElement && ( document.documentElement.clientWidth ||
document.documentElement.clientHeight ) )
  {
window_width = document.documentElement.clientWidth;
window_height = document.documentElement.clientHeight;
}
  else
  if(document.body && ( document.body.clientWidth ||
document.body.clientHeight ) )
  {  
window_width = document.body.clientWidth;
window_height = document.body.clientHeight;
}
}
var left = Math.round((window_width - 200) / 2);
var top = Math.round(((window_height - 46) / 3) + 46);
document.getElementById('pageIsLoading').style.left = left+'px';
document.getElementById('pageIsLoading').style.top = top+'px';
</script>
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</div>

<script type="text/javascript">
if (window.addEventListener) {
  window.addEventListener('load', hideLoading, false);
}
  else if (window.attachEvent) {
  var r = window.attachEvent("onload", hideLoading);
}
  else {
hideLoading();  
}
</script>