Graphviz plugin

Hi All. Has anyone played with accessing the graphviz plugin from Velocity? I have managed to get it creating graphs from my objects and displaying with various options, but I seem to be stumbling on the last step of adding client side image maps to allow the user to drill down easily. The problem is that if I call $xwiki.graphviz.outputDotImage($graph, "cmapx", true) it will only render the mapping file (which I need) instead of the whole page so I am assuming I have to call $xwiki.graphviz.getDotImage($graph, "cmapx", true) and then display it. I have also tried to write it, then access it via $xwiki.getExternalURL() but no go. It works as expected when you retrieve it from a separate file, but not on the fly. Just a reference returned that doesn't seem to respond to Name or Value methods. Example below: #set($graph = 'digraph abstract {"Node 1"[URL=WebHome];"Node 2"[URL=WebHome]; "Node 1" -> "Node 2";}') #set($graphfilename = $xwiki.graphviz.writeDotImage($graph, "jpg", true)) <img src="/xwiki/bin/dot/$doc.web/$doc.name/$graphfilename" usemap="#abstract"> #set($graphmap = $xwiki.graphviz.getDotImage($graph, "cmapx", true)) $graphmap Any suggestions are gratefully accepted. Cheers, Mark