Add to Cart Dissapeared

I seem to have lost the ability to have items added to the shopping cart. Not sure when it happened but it was there at one time. For example, if you select an item at this page:
silverconnection.cloudaccess.net/index.p...ategory/19-necklaces
then there is no cart functionality with the item anymore. Not sure if I disabled anything.

Thanks.

Disregard, got it back. The Display 'Add to cart' button default parameter under Configuration>Display was set to No.