Re: Possible to have a mouseover event pop up a wiki page?
I'm no genius here but I'll pop in with these suggestions in the hope they may help if you cannot find an easy solutiuon in Tiki.
The CoolIris client side extension for Firefox that does exactly this for any link on any website. If you have a defined community of users and you can convince them to use Firefox that might work.
Another lead might be to pick apart the pop up script in the Tiki Calendar and try to adapt it.
Wiser ones than I will surely weigh in. Good luck!