Hello,
Since Adora (and Angua ?) compatibility javascript functions findPosX and findPosY use jQuery().position() to mimic the old behaviour. position() returns offset relative to containing element.
This current behaviour breaks the indexmenu plugin, while this plugin works perfectly in Rincewind. Using jQuery().offset() which returns offset relative to document, fixes the problem, as demonstrated on the attached image.
small patch attached.
/Schplurtz.