More information:
http://www.wysiwygwebbuilder.com/openstreetmap.html
You can download the new extension via the Extension Manager: Menu->Tools->Extension Manager->Online Gallery->Miscellaneous
As always, PDF documentation is included in the download.
Note:
This is an extension from my private collection. It is shared "AS IS".
If you find my (free) extensions useful and would like me to continue to make improvements or create new extensions, then please consider making a PayPal donation:
http://www.wysiwygwebbuilder.com/donate.html