I know I've seen this before in the forums.... but several searches later an still no luck I'm just going to ask.
What dimensions (px by px or in x in) are recommended for the floor plan images?
It's not listed on the wiki here: http://wiki.linuxmce.com/index.php/Floorplans
Also, I have updated the page that you linked to with this info, as it seems like a good place for it. Mostly just pasted the details from the other page, plus linked them.
If anybody knows definitively about whether png AND jpg are supported, please edit both pages accordingly. The page I got my info from says either one is good, but the web admin is adamant about it being png. "(must be PNG)"