WMODE

Value Window | Opaque | Transparent
Template variable: $WM
Description (Optional) Lets you take advantage of the transparent movie, absolute positioning, and layering capabilities available in Internet Explorer 4.0. This tag works only in Windows with the Flash Active X control.
Window plays the movie in its own rectangular window on a web page.
Opaque makes the movie hide everything behind it on the page.
Transparent makes the background of the HTML page show through all the transparent portions of the movie. Animation performance might be slower when you use this setting.
The default value is Window if this attribute is omitted. Object only.