Specific Catalgou Picture Size

Hi,

So i stopped my images going blurry. I have set the single product image size to what I want.

I am know having difficulty with my catalog images.

What code would I need to specify the size of catalouge images? I want them to be corpped and in the center of the product div.

Cheers,

Stuart

http://www.lovemrdarcy.com/shop/

http://ww.wp.xz.cn/extend/plugins/woocommerce/