Problem with Internet Explorer

Hello,

It seems the jQuery is not loading into IE 8 or 9 into the surveys.

It works perfectly with others browsers...

The buttons "back - continue" are not active.
I've been playing with all options of the plugin "CoreJoomla - jQuery Plugin"

The CoreJoomla Framework API Library is also installed.

Versions Com Survey: 1.7.6 , module : 1.7.0, CoreJoomla - jQuery Plugin : 2.0.2

Could you help please ?

Thanks !