Frame flashes when changed in IE

[Mark]

Hello.

Here is a simple frameset with two menu choices and
a target frame which has a background image. The
documents that are displayed in the target frame have
their background defined as transparent.

http://www.canleyworks.com/temp/ie_flashes

In a Mozilla-based browser (I'm using Firefox)
the target frame changes smoothly without any
apparent disruption of the background image.
In Internet Explorer 6.0, the target frame flashes
white briefly whenever the menu selection is
changed.

Is there a way to make this work properly in
IE without specifying the background image in
each document that will be displayed in the
target frame?

Thanks
-Mark