Cannot display treemap greaph



I am studying splunk app framework based on the url :
When I follow the instructions on the documentation, I cannot display the treemap graph of Example6 and Example7.
Please see the attachment. Does any know how to show the graph successfully ? Or Am I missing anything ? alt text

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These examples currently only render using Firefox. Protovis is know to have some browser issues and a fix is being investigated, including switching to the D3 library.