Fading gradients help

Hi there, been using flash for a while now but im having big
problems in sorting this MAJOR problem out:
It goes as follows.
The movie found at:
http://www.ronguy.co.uk/fla/help.sfw
is a preview of the problem
Basically i need to fade 1 gradient in over the top of
another to give the appearance of the screen getting darker,
however when i do so it produces these awful grainy lines across
the page where the colours are changing.
How it is done is a simple fade in with the new gradient on
an above level using alpha tween.
I have tried a number of things to rectify this problem,
these are as follows:
Use jpeg images of the gradient instead of the flash vector
shapes,
Tryed to fade the lighter layers out instead of fading darker
in.
Tryed using the blur filter on the whole clip.
Need to know if there is any way to make this a really smooth
transition, action scripts maybe? or different blending options, i
dont know. Somebody help please.
Fla file available also at:
http://www.ronguy.co.uk/fla/help.fla
Thanks guys.
here

SImple answer - display the movie much smaller. Open
Dreamweaver (or whichever html ditor you prefer) make a one cell
table and put the movie in it. Adjust the size downwards until the
banding stops.
One comment - the fade of one grad over the other is fairly
slow (on my browser). Is you movie set to run at 31 fps to make it
the same on all platforms and browsers ?
Best wishes
Tony

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