i'm doing an animation on a navigation, works great in all browsers, only in ie7 when i click the second time on a link the all "#sx" div moves up of about 20/30 px!

I really cant figure out what's happening, i've checked the code in jsfiddle and it's all ok!!

if you like you can take a look to the code here:   http://jsfiddle.net/mkkqm/2/

Thanks in advice

Apprentice