I\'m running on version 1.3.2.1, but on my client\'s server they had Magento 1.3.0 so my previous code to display images for my local copy,
echo $this->he
You can try to replace $this->
by Mage::
in some cases. You need to convert to string.
In my case i'm using DirectResize extension (direct link), so my code is like this:
(string)Mage::helper('catalog/image')->init($_product, 'image')->directResize(150,150,3)
The ratio options (3rd param) are :
Update: other info and versions here
The common way, without plugin would be:
(string)Mage::helper('catalog/image')->init($_product, 'image')->resize(150)
You can replace 'image' with 'small_image' or 'thumbnail'.