Toggle marginTop on mouseleave div
<p>I have a toggle function that slides a div up and down.. But how can I make it toggle marginTop -200 on mouseleave?</p>

<p>Should I have a separate function for mouseleave?</p>

<pre><code>$(document).ready(function() {
    $('.menu-item-40').toggle(

    function() {
        $('#slidenav').animate({
            marginTop: '0'
        }, 500);
    }, function() {
        $('#slidenav').animate({
            marginTop: '-200px'
        }, 500);
    });
});​
</code></pre>
