title: Magento force www throws to the homepage
body: <p>if I go to a product with www. it works and without it throws me to the homepage.
  not sure how to still enforce www. but direct back to the product page and not to the homepage.
  e.g:
  works:
  www.amazonia.com.au/powder.html </p>
  
  <p>goes to homepage:
  amazonia.com.au/powder.html</p>
  
  <p>help much appreciated, thank you.
  aaron.</p>