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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Documento senza titolo</title>
<style type="text/css">
#apDiv1 {
	position:absolute;
	left:155px;
	top:41px;
	width:300px;
	height:auto;
	z-index:1;
	border:thin ridge #999;
}
</style>
</head>
<script type="text/javascript">
 function mostra(val){
	  document.getElementById('apDiv'+val).style.visibility='visible';
	 }
	 
 function nascondi(val){
	  document.getElementById('apDiv'+val).style.visibility='hidden';
	 }
</script>
<body>
<div id="apDiv1" style="visibility:hidden;">
  

riassetto, vite+ dado, ecc...</p>
  

CHIUDI</p>
</div>


Intervento in manutenzione</p>
</body>
</html>
+ o - ?