You've been very helpful, Don, but one thing seems to lead to another!! The system won't save the plugin because .. "Fetched 359124 bytes from already existing file on your server. Saving file as /services/webpages/l/a/lamartinie.fr/public/blogs/templates_c/package_event_en.xml...

Cannot write to ...

Thanks, Don. My version of Serendipity is provided by Aplus.net. Do the implementations vary? Can't find any mention of this plug-in on the list of plug-ins shown on this site.

Mouse over? How can I make thumbnail pix bigger on (say) mouse over .. or by some other means .. when a viewer wants to enlarge just the one pic at a time?