If you want to show product thumbnail on any page in your requirement size then At the showing page : <img src="<?php echo $this->helper('catalog/image')->init($_product, 'small_image')->resize(100, 100) ?>" border="0"...

There’s a little confusion among some on how to import products into a Magento ecommerce store. I spent some time today researching and trying to find the best method on doing this. The reason for my research is because there was no simple documentation...