How to hold the position of scroll when button is clicked.

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ASP

HTML

It seems working on Google Chrome but not in IE7. Why is it?

Can anyone please tell me why? I've search the net still has no answer . Thank you so much in advance :)

ON HEADER:

<script type="text/javascript">
        window.onload = function () {
            var div = document.getElementById("divscroll");
            var div_position = document.getElementById("div_position");
            var position = parseInt('<%=Request.Form("div_position") %>');
   if (isNaN(position)) {
       position = 0;
   }
   div.scrollTop = position;
   div.onscroll = function () {
       div_position.value = div.scrollTop;
   };
};
</script>

ON BODY:

<div class="scroll" id="divscroll">
                <input type="hidden" id="div_position" name="div_position" />