slideDown doesn't work fine in IE7. please help

it works fine int all other browser ( including IE6, 8) but not work in IE7.

The menu item slided down but it didn't push the next element down

Please help

thanks

<script type="text/javascript">
	jQuery(document).ready(
	function () {
	jQuery('#menudoc a.menuItem').click(
	function () {
	var sub = jQuery(this).next('div');
	if (sub != null) {
	if (sub.is(':hidden')) {
	sub.slideDown('200');
	}
	else {
	sub.slideUp('200');
	}
	}
	} //function
	); //click
	} //function
	);
	</script>
	<style type="text/css">

	#menudoc li
	{
	clear: both;
	display: list-item;
	position: relative !important;
	}
	#menudoc li div
	{
	display: none;
	}
	ul.subMenu li
	{
	margin-top: 5px!important;
	}
	</style>

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