Alex Le Bek wrote:
It is coded for external links - the problem was my LocalSettings.php set $wgImageMapAllowExternalLinks = true; (as instructed)
But the extension sets this to false in ImageMap.php! Just goes to show I should have looked at the source files myself. Perhaps this needs to be noted in the installation instructions? (http://www.mediawiki.org/wiki/Extension:ImageMap#Installation_Guide) Thanks to Tim Starling I can now click from my logos elsewhere.
You're expected to add parameters to an extension after include()ing its file. Added a note to the page.