jwplayer – detecting the start-Collection of common programming errors

I am trying to detect a start click in jwplayer. I am embedding it via swfobject so the method is slightly different from the example in the api, http://www.longtailvideo.com/support/jw-player/jw-player-for-flash-v5/16024/listening-for-player-events

I have tried

var flashvars = {
    'file':'xxx',
    'streamer':'xxxxxx',
'image':'xxxxx',
'plugins':'xxxxx',
'gapro.accountid':'xxxx',
'gapro.trackstarts':'xxxx',
'gapro.trackpercentage':'xxxx',
'gapro.tracktime':'xxxx',
'logo.file':'xxxxx',
'logo.link':'xxxx',
'logo.hide':'xxxx',
'logo.position':'xxxx'

};

jwplayer().onPlay(function() {alert('it has started'});

jwplayer() is not defined, how do I defined an object to detect the click?