basic-google-maps-placemarks mouseover/onclick

I’m sorry, I think this is a simple issue, but I can’t seem to get my head around it.

Can I modify this plugin, such that the placemark text shows on rollover, and the page of the same name (but not in the placemark folder) is opened in the same window onclick?

Does anyone see any problems with doing this?

Thanks!

http://wordpress.org/extend/plugins/basic-google-maps-placemarks/