Disable or hide "add to cart button"

[BJng]

Hi to all,

 

 

I've got many products with combinations. What I need is: 

If

a product is "available for order even it is out of stock"

then

hide or disable the "add to cart button" for those combinations that have quantity = 0

 

The optimum it should be that this behaviour should happen only if the product is associated to a specific supplier.

 

 

I tryed to modify product.tpl and product.js without any success.

Can anyone help me?

Thanks in advance

 

Stefano