[Deff]

<script type="text/javascript" src="http://yandex.st/jquery/1.4.4/jquery.min.js"></script>
<style type="text/css">
div {
  padding:12px;
  margin:4px;
  min-width:30px;
  max-width:66px;
  border:2px solid red;
}
#children {
  border:2px solid blue;
}
</style>

<div class="parent">
1
</div>

<div class="parent">2
    <div id="children">
    </div>
</div>

<div class="parent">3
</div>

<script type="text/javascript">
var Hide=$("#children").parent("div.parent");
setTimeout('Hide.slideUp("slow")',3000)
</script>