made the "photo not available" image configurable in render-config.xml

src/com/silverwrist/venice/servlets/format/TopicPosts.java

@@ -502,7 +502,7 @@ public class TopicPosts implements JSPRender
     StringBuffer buf = new StringBuffer("<IMG SRC=\"");
     String url = (String)(uid_photos.get(new Integer(uid)));
     if (url==null)
-      url = rdat.getFullImagePath("photo_not_avail.gif");
+      url = rdat.getPhotoNotAvailURL();
     buf.append(url).append("\" ALT=\"\" WIDTH=").append(photo_size.width).append(" HEIGHT=");
     buf.append(photo_size.height).append(" ALIGN=LEFT BORDER=0 HSPACE=2 VSPACE=2>");
     return buf.toString();