function VideoPreviewPopUp(){
//        var url = "http://www.pbs.org/wgbh/ballroomchallenge/videopreview.html";
        var url = "video.html?clip=abc_s3_promo&ar=16:9";
        var a="toolbar=no,location=no,directories=no,menubar=no,scrollbars=yes,resizable=yes,width=590,height=500";
        if (navigator.appName.indexOf("Microsoft")>=0) a+=",left=50,top=50";
        else a+=",screenX=50,screenY=50";
        if( floater != null )
                if( floater.closed == false )
                        floater.close();
                        var floater = null;
        floater=window.open(url,"videopreview",a);
        floater.focus();
}

i