Hmm I tried playing around with your page a bit, but nothing jumps out at me as the problem yet. So I simply tried firing up the 1st default demo of DHTML Window, and loading the video in question:
Code:
<!-- 1) DHTML Window Example 1: -->
<script type="text/javascript">
var googlewin=dhtmlwindow.open("googlebox", "iframe", "http://www.dyslexia-international.org/ONL/EN/Media/VideoClip.htm", "#1: Google Web site", "width=590px,height=350px,resize=1,scrolling=1,center=1", "recal")
googlewin.onclose=function(){ //Run custom code when window is being closed (return false to cancel action):
return window.confirm("Close window 1?")
}
</script>
That works in FF. This leads me to believe it's something specific to your page, whether it's particular CSS declaration or something else. You may want to start with a fresh blank page with just the script, verify it works, and then gradually add back the other parts of your page to see where the culprit lies.
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