Firefox/IE Event Handling Differences - attaching an event

I have some code which works in IE, but the event does not get attached in Firefox. Any ideas as to the equivalent in Firefox?

<script language="javascript">

document.getElementById('Player1').attachEvent('PlayStateChange', GetPlayState);

function GetPlayState()
            if (document.getElementById('Player1').playState==8)

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You need addEventListener('click', myfunction, false)

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Extra information on the subject can be found here:
Do it like this (via Scott Andrew)

function addEvent(elm,evType,fn,useCapture) {
     if (elm.addEventListener) {
          elm.addEventListener(evType, fn, useCapture);
          return true;
     } else if (elm.attachEvent) {
          var r = elm.attachEvent('on' + evType, fn);
          return r;
     } else {
          elm['on' + evType] = fn;
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