How to slide up a div 15px to the top
<pre><code> $("SomeInputField").keydown(function () {

     $("SomeDiv").css("top", "30px");
 });
</code></pre>

<p>First this is making a div go 30px from the top</p>

<pre><code> $("SomeInputField").bind("keyup", function () {

     $(this).val() == "" &amp;&amp; $("SomeDiv").css("top", "15px");
 });
</code></pre>

<p>Second, this is making the div go up 15px.</p>

<p>My question: How can I make the div in the second code go up "smoothly", so not "instant" but with some sort of slide up(15px) event.  </p>
