I have installed Check availability by zip/postal code from magento connect so that it checks product availability using pincode.
reference :
http://www.magentocommerce.com/magento-connect/check-availability-by-zip-postal-code.html
It is working fine but my add to cart button in all my product page is disabled.
I guess checkdelivery.xml is conflicting. please guide me how to enable add to cart button.