te lo posto fino al primo link

codice:
<html>
<head>
<script language="JavaScript" type="text/javascript" src="barnav.js"></script>

<script language="JavaScript">
<!-- Nascosto
  function loadtwo(page2,page3,page4) {
    parent.frames['sommario'].location.href=page2;
    parent.frames['principale'].location.href=page3;
    parent.frames['inferiore'].location.href=page4;
}
// -->
</script>

</head>

<style type="text/css">
BODY{ margin: 0px;}
</style>

<title>Castedil Srl</title>


<base target="principale">



<body leftmargin="0" topmargin="0" marginwidth="0" marginheight="0" scroll="no" bgcolor="#E47722">



</p>
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" id="AutoNumber1">
  <tr>
    <td width="100%">
    <a onMouseOver="imgOn('azienda')" onMouseOut="imgOff('azienda')" href="javascript:loadtwo('sx.htm','azienda.htm','base.htm')">
    [img]images/azienda.gif[/img]</a></td>
  </tr>