codice:
<html>
<head>
<script type="text/javascript">
function getElements()
{
return document.getElementsByTagName("input").length;
} 
</script>
</head>
<body>
<div id="pippo"></div>
<input type="text" size="20" />

<input type="text" size="20" />

<input type="text" size="20" />


<script type="text/javascript">document.getElementById('pippo').innerHTML=getElements();</script>
</body>
</html>