<html>
<head>
<script type="text/javascript" src="jquery-1.6.2.js"></script>
<script type="text/javascript">
$(function()
{
alert($('.test :hidden').length); //read in sequence, first .test then :hidden
alert($('.test:hidden').length); //read simultaneously, .test && :hidden
});
</script>
</head>
<body>
<p class="test">
<p style="display:none">aaa</p>
<p style="display:none">bbb</p>
<p style="display:none">vvv</p>
<p class="test" style="display:none">ddd</p>
</p>
<p style="display:none">eee</p>
<p style="display:none">fff</p>
</body>
</html>
alert($('.test:hidden').length);
It is possible to read this from the end. the hidden and class name test element
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