It's possible to show output of Yahoo pipes in Joomla. A Yahoo pipe can be output to a kml-file:

{mosmap kml='http://pipes.yahoo.com /pipes/pipe.run? _id=6d664c3b17997b47ff5ebf2561a7e044 &_render=kml'| kmlrenderer='geoxml'| kmlsidebar='left'| kmlfoldersopen='1'}

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Thanks to Hani Juha.