bootstrap calendar javascript alert in cakephp

well, i am try to use this calendar in cakephp and it works.
https://github.com/ahmontero/bootstrap-calendar
I am a very new and never learnt jquery before.
ok now i wish to did some modification on this calendar source.
As u see inside the demo.html got that js code.

.on('onEvent', function(event){ alert(event.day.valueOf() +'-'+ event.month.valueOf() +'-'+ event.year.valueOf() ); })

The onEvent will alert out the date as we picked as events day.
Well, my question is .. how to change the word of the onEvent alert.

Example: i want it alert(hello my world); when i onclick the event days as i done setting.

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