No sé si es lo que pides pero creo que sí:
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<html>
<head>
<title>Prueba</title>
</head>
<script language="Javascript" type="text/javascript">
<!--
function cambio(){
this.resizeTo(800,600);
}
//-->
</script>
<body onload="cambio();">
</body>
</html>
---------------
<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" width="190" height="51"><param name="bgcolor" value="#0066CC"><param name="movie" value="http://www.webareyou.com/Movie1.swf"><embed src="http://www.webareyou.com/Movie1.swf"></embebed></object>