Any idea how to implement a pop-up window just big enough for an image?  I 
don't know what size images are going to be uploaded.

This is how I've done the pop-up, and it works:

pages.xml

  | <page view-id="/search.xhtml">
  |     <navigation from-action="#{searchSessionBean.setPhoto}">
  |             <render view-id="/hppu.xhtml"/>
  |     </navigation>
  | </page>
  | 

and on the view:

  | <h:column>
  |   <f:facet name="header">Show the Photo</f:facet>
  |   <s:link target="PopUp"   
onclick="window.open(null,'PopUp','width=270,height=290')" 
  | value="Show the Photo" action="#{searchSessionBean.setPhoto}" />
  | </h:column>
  | 

Incidentally, not using pages.xml and supplying the URL of the pop-up page does 
not work.  The page that pops up is the same as the page on which the link was 
clicked.  The same goes for using navigation.xml

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