End of Page Slide out jQuery effect
<p>I'm trying to implement Page Slideout jQuery effect by Mary Lou at <a href="http://tympanus.net/codrops/2010/04/13/end-of-page-slide-out-box/" rel="nofollow">http://tympanus.net/codrops/2010/04/13/end-of-page-slide-out-box/</a> 
Everything was fine until I tried to open it on Firefox19/Mountain Lion OSX and FF19/Win7. There is an annoying bouncings effect when the slide is out.
This issue even occurs on the original demopage too : <a href="http://tympanus.net/Tutorials/EndPageSlideOutBox/" rel="nofollow">http://tympanus.net/Tutorials/EndPageSlideOutBox/</a>
Please take alook at this video to understand what I mean : <a href="http://d.pr/v/zhgz" rel="nofollow">http://d.pr/v/zhgz</a> </p>

<p>If you someone could help me out, I would really appreciate it. Thanks</p>
