Fading An ActiveX-object Into The Background

How can I create a fade with javascript that fade an activex object
(quicktime) to the background and not to the IE windowed control.

I call this function several times, each time decreasing the "opacity".
id is the quicktime activex object.

I have tried to set background:tranparent and
background-color:transparent in my style sheet.

//change the opacity for different browsers
function changeOpac(opacity, id) {
var object = document.getElementById(''+id+'').style;
if (object.opacity) {
object.opacity = (opacity / 100);
} else if (object.MozOpacity) {
object.MozOpacity = (opacity / 100);
} else if (object.MKhtmlOpacity) {
object.KhtmlOpacity = (opacity / 100);
} else if (object.filter) {
object.filter = "alpha(opacity=" + opacity + ")";
}
}