Urgent Help Needed: can''t add product to chart

[naturalintegrators]

Hi All
I've got a very big problem.
The store affected is running a 1.3.8a with italian lang pack
Add ons Query cache (I don't know if it really helps)
Add on simple SEO url
I'm unable to make a new product work properly: I can add it, edit it, add atttributes and so on but I can't add it to the cart if I try to buy it: the buy button do not work at all; I tryed to make a new product: but the button don't work (I'm desperate 'cause I'm running a promotion on it)
I tryed to change a product to that but it don't work again
the site is m y l e v i s.us/store/
the product affected is 3-x-2-levis-501-vintage-used-occhiali-da-sole-p-194.html I've tryed to remove attributes but nothing seems to help
the product is the only product in the "fuori tutto" section (I tryed to make a new category too)
Please any suggetion is wellcome
Thank you
Enrico

[Marg]

You've added a Paypal buy now button within your description - Can't do this since it's a form within a form and will break the cart. Remove the Paypal button and see if that fixes it.

[naturalintegrators]

It Works!
Thank You so Much!