title: Change product image size on Magento ecommerce
body: <p>I have a challange: I have two kinds of product images: 140x140 (without watermark) and 600x600 (with watermark). I need show up the products with the thumbnails (140x140) on catalag page and when the product page is open, finally shows the big images with watermarks (this one I don't matter wich size should be).</p>
  
  <p>Does anyone know where should I change it?</p>
  
  <p>Thanks in advanced!</p>