I previously released this program as a stand-alone utility. Now I have added it as a Special Page extension:
http://www.mediawiki.org/wiki/Extension:ImageMapConversion
This special page will take an HTML image map file local to a user's computer and convert it to the format required for use in a wiki's <imagemap> extension. It is aimed at those who use either Tim Starling's ImageMap extension or my ImageMap (Alternate) extension.
This special page will take a file that is: - An HTML web page containing an image map - An HTML file compatible with Shannon McNaught's ImageMap extension - An HTML file created by an image utility such as GIMP that generates image map statements.
The output can be copied between the <imagemap> tags on a page and then modified to fix the URLs to be compatible with the wiki (if required).
This can also be used to convert a wiki from using McNaught's version of imagemap to one of the newer versions.
Mike