html檔裡面寫一支function:
<script>
function openwin(url) {
var newwin = window.open(url,'test','width=300,height=300');
}
</script>

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Flash:
例如在按鈕上
on(release){
getURL("javascript:openwin('test.htm')");
}

謝謝Bryan大大，小弟試試^^