Flash content in new window gap issues

Help, please…
I have designed a site using Flash MX 2003 (www.eastboundrecordings.com) and chose the dimension 640 x 480 in Flash.
The ‘homepage’ I created using HTML and copied some javascript to open the Flash content in a new window.
PROBLEM - The Flash content does not fit snuggly in the new window. Instead the .swf sits in the bottom right and there is an ugly gap between the left/top side of the content and the edge of the window which is doing my head in. The code I used to open the content in the new window is… <SCRIPT LANGUAGE=“JavaScript”>
<!-- Begin
function Launch(page) {
OpenWin = this.open(page, “main”, “toolbar=no,menu,location=no,bar=no,scrollbars=no,resizable=no,width=655,height=500”);
}
// End -->
</SCRIPT>
NB (The code I’m currently using is"width=655,height=500" as this looks neater than if I input 640480 despite the flash file being published as 640480)
I hope this makes sense and someone can help. cheers o