Wrapper not displayed with IE

Wrapper not displayed with IE

Hi

I am using this jquery plugin
http://tympanus.net/codrops/2010/06/07/fancy-sliding-form-with-jquery/
on my webpage
http://associationzyggy.free.fr/SurMaTableDeChevet/ (clic on the green button "demande de devis")

I do not understand why my page is correct with firefox but bad with IE.
In fact the wrapper is not displyed with IE

Thanks