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hiddenObject.form
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<html>
<body>
<form id="form1">
<input type="hidden" id="hidden1" />
</form>
<p>The id of the form containing the hidden element is:
<script type="text/javascript">
x=document.getElementById('hidden1');
document.write(x.form.id
);
</script></p>
</body>
</html>