<html>
<body>
<div onclick="alert( document.all[ 'q' ].length )">test</div>
<input name="q" type="hidden" id="q" />
<input name="q" type="hidden" id="q" />
</body>
</html>
<body>
<div onclick="alert( document.all[ 'q' ].length )">test</div>
<input name="q" type="hidden" id="q" />
<input name="q" type="hidden" id="q" />
</body>
</html>
q_num=document.formname.q.length;
alert(q_num);