[Plugin: Weekly Schedule] problems with tooltip

hello

thank you very much for that great plugin called: weekly schedule !

but i am sorry, i am not able to get a tooltip run? please can you send me a sample “html” to insert in “description” that a picture and a description is popping up in the tooltip near the schedule entry?

you can look at: http://www.upendo.tv

for my installation. everything works, but no tooltip ? is there a special other plugin necessary? is there any other thing i forgot ?

thank you for your answers
jerome