non funziona...ma sicuramente ho toppato io qualcosa

codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Documento senza titolo</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<script>
function closeoverlay() {
  document.getElementById('overlay').style.display = 'none';

}
function openoverlay() {
  document.getElementById('overlay').style.display = 'block';

}
setTimeout('closeoverlay()', 10000);
</script>
</head>
<body onload=" openoverlay();setTimeout('closeoverlay()', 10000);">
<div id="overlay" style="position:absolute; width:452px; height:200px; z-index:1; visibility: hidden;">
  <div align="right">[img]/png/productronica2005.png[/img]
    <map name="Map" id="Map">
      <area shape="rect" coords="11,166,53,185" href="#" onclick="closeoverlay()" />
    </map>
  </div>
</div>
</body>
</html>