ya resolvi el problema, el codigo quedaria asi
principal.htm
Código HTML:
<SCRIPT>
function playIt2() {
var time = Player.controls.currentPosition;
var mins = Math.floor(time / 60);
var seg = Math.floor(time - (mins * 60));
frames.iframeXCambiar.document.getElementById('divXCambiar').innerHTML = mins + ':' + seg;
timerID= setTimeout("playIt2()", 1);
}
</SCRIPT>
<a href ="#" onclick="playIt2('a')">aaaaaa</a>
<div id="divXCambiar">hola</div>
<iframe name="iframeXCambiar" src ="iframe.htm"></iframe>
y la iframe.htm
Código HTML:
<div id="divXCambiar">hola</div>
saludos