JQuery drop down bobs up and down continuously
<p>I am using jquery to hide/show an DIV on hover of an LI. When I do this the div appeared but pops up and down without stopping until I take my mouse off the LI.</p>

<pre><code>$(document).ready(function () {
    $('li.menu_head').mouseover(function () {
       $('div.newsadviceDrop').slideToggle('medium');
    });
});
</code></pre>
