[Zope] referencing images in products

[Dennis Allison]

I have a product which needs to reference some icons which are part of the 
product.  Following the usual structure, the icons are www sub-directory of 
the product.  The dtml that wants to reference the image is in the dtml 
sub-directory.  What's the reference mechanism?

	<img src="../www/image.png">

in the dtml code does not resolve to the image.  Nor doe the equivalent <dtml-var ...>
formulation.  What should the reference be?