Try to listen to events in javascript for a flat video in krpano

Hi everyone,
This is may first post, so, congratulations for this wonderful tool !!!

As I said in the title, i try to listen to the events of time & url changing when a video is played.
when a time is reached i wanna trigger a js function whatever it is

I got this script that i put directly in my index.html file :

function jstest()
		{ 
		var krpano = document.getElementById("krpanoSWFObject");
		var time = krpano.get("plugin[video].time"); // or .totaltime or .videoDOM
		setTimeout(function(){ alert(time); }, 3000);
		}

but it only alerts me "null"...

Can someone tell me where i made a mistake ?

kind regards, vYk