Accordion menu glitch

Hi all!!

I have created neat little script for my accordion menu and it is working almost fine. But I have some “glitch” issues:(

Here’s my problem: try clicking “Home” link and then “About Us” link back and fourth and pay attention to bottom links (“Service” and “Contact” links) if you look closely you can see that those links are moving a bit (not much one or two pixels) while the animation is running.
Is there any way to fix this behavior? If possible i would like to keep the Html structure intact. Here’s link the to Fiddle to show you my problem. Thank You!!

I don’t see that in Firefox. What browser are you using?