[Zope] Icon Product?

I'm trying to create an icon zclass for use in navbars. I've created a zclass containing string attributes link, alt_text, and image (as a url). I've tried various ways including python script to get the icon to render as <a href="..link.." alt="..alt_text.."><.. img tag ..></a> to no avail. I'd prefer to keep the calling syntax as brief as possible (otherwise, what's the point of the class?). Anybody have any suggestions (or existing products)?