Given the following html table and script shown below I am having a problem where the mouse leave event appears to fire right after the mouse enter, even if I don't move the mouse out of the row.

<script type="text/javascript" language="javascript">
    function highlightRows(iMainID) 
    {
        $('tr[mainid=' + iMainID+ ']').each(function() {
            if ($(this).attr('old') == undefined) {
                $(this).attr('old', $(this).css('backgroundColor'));
            }
            $(this).animate({ backgroundColor: "#FFFFCC" }, 500);
            $(this).mouseout(function() {
                if ($(this).attr('old') != undefined) {
                    $(this).animate({ backgroundColor: $(this).attr('old') }, 500);
                }
            });
        });        
    }
</script>
<table>
    <tr> 
      <td mainid="1" onmouseover='highlightRows(1)'><div>text</div></td>
      <td mainid="1" onmouseover='highlightRows(1)'><div>text</div></td>      
      <td mainid="2" onmouseover='highlightRows(2)'><div>text</div></td>
    </tr>
<table>