Cool, this pictures comes from an attachment from another wiki page using the code (see http://ossgtp.xwiki.com/xwiki/bin/edit/XWiki/PatrickChanezon?language=en) to edit the code, or click code, then edit content (weird)).<br/>
<pre>
#set($newdoc = $xwiki.getDocument("Main.23Septembre2004Ludo"))
#set($imageurl = $newdoc.getAttachmentURL("DSC00254-1.jpg", "download"))
<img src="$imageurl" height="150">
</pre>