Maintain scroll position on post back script not work in IE?

Below is script that works perfectly in FF, Opera but not in IE
-----------------------------------------
Head section:

<script type="text/javascript">
function saveScrollPositions(theForm) {
if(theForm) {
var scrolly = typeof window.pageYOffset != 'undefined' ? window.pageYOffset : document.documentElement.scrollTop;
var scrollx = typeof window.pageXOffset != 'undefined' ? window.pageXOffset : document.documentElement.scrollLeft;
theForm.scrollx.value = scrollx;
theForm.scrolly.value = scrolly;
}
}
</script>

In form:

<form action="whatever.php" name="enrollment" method="post" onsubmit="return saveScrollPositions(this);">
<input type="hidden" name="scrollx" id="scrollx" value="0" />
<input type="hidden" name="scrolly" id="scrolly" value="0" />

Just above </body>:

<?php
$scrollx = 0;
$scrolly = 0;
if(!empty($_REQUEST['scrollx'])) {
$scrollx = $_REQUEST['scrollx'];
}
if(!empty($_REQUEST['scrolly'])) {
$scrolly = $_REQUEST['scrolly'];
}
?>

<script type="text/javascript">
window.scrollTo(<?php echo "$scrollx" ?>, <?php echo "$scrolly" ?>);
</script>

----------------

By testing with IE window.scrollTo does not remember position and always show window.scrollTo(0, 0); while FF correct remember position and scroll to right position.

So anybody have idea what is wrong with IE?

Thanks