Problem configuring and adding categories

Here are the results on my end on your page:
On Firefox 5.0 it works great.
On Chrome it works great.
On IE 7 and 8 it works great.
On IE9 I have the javascript errors:
SCRIPT5022: DOM Exception: INVALID_CHARACTER_ERR (5)
mootools-core.js, Ligne 122 Caractère 47
SCRIPT5007: Impossible d’obtenir la valeur de la propriété « set » : objet null ou non défini
modal.js, Ligne 156 Caractère 3
SCRIPT5007: Impossible d’obtenir la valeur de la propriété « set » : objet null ou non défini
modal.js, Ligne 156 Caractère 3
and it opens the image on a new window. Then, when closing the window, I see again the previous window with the product page.
These javascript errors comes from the Joomla mootools/modal library, we can't do nothing on HikaShop to avoid them except not using joomla's modal system. With a template override, it's possible to have HikaShop use rokbox instead of the modal library of joomla, as explained on that thread: www.hikashop.com/support/forum/3-bug-rep...y.html?lang=en#19918