Hover in and out moving too fast, slidedown get error
<p>Hover in and out <code>.logo</code> moving too fast, will get error,  the div <code>.nav_b</code> not show again.<br>
but it's weird if demo in <a href="http://jsfiddle.net/R4yX2/" rel="nofollow">jsfiddle</a> is fine..  </p>

<p>I can't seem how to fix it, I also tried use <code>animate</code> like the code below, so any help will be appreciated, Thanks...  </p>

<pre><code>$('.logo').hover(function(){
    $('.nav_b').slideDown({duration: 200, queue: false});

    // $('.nav_b').animate({height: 'show', width:'hide', easing:'swing'}, {duration : 200, queue: false});     
},function(){
    $('.nav_b').slideUp({duration: 200, queue: false});

    // $('.nav_b').animate({height: 'hide', width:'hide', easing:'swing'}, {duration : 200, queue: false});
});
</code></pre>
