WN - Flash - SWF-filen krymper

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Skulle bli otroligt glad om nån kan hjälpa mig att komma förbi detta problem:

I have had this problem for a long time and it irritates me a lot!
I would give you an example from the movie a just created and you can watch it here:
http://www.spaceboys.com/flash/right_images.html

The movie contains three movieclips at different locations in the movie... each of these movieclips contains a couple of images beeing randomized when the movie loads.

My problem is:
I have created a scene in Flash MX 2004 that is 290 px wide and 256 px high. But when I publish my movie using the settings Flash Player 7/ActionScript 2.0 and then views the movie in the browser (both IE and Firefox), the movie have been subtracted by a couple of pixels... the movie is now 288 px in width (should be 290) and 255 px in height (should be 256).

The three images should be :
The one to the left: should be 111x256 px, but appears as 111x255 px
The upper right: should be 177x127 px, but appears as 175x126 px
The lower right: should be 177x127 px, but appears as 175x126 px

The space between each image should be 2 px vertical and 2 px horisontal, but the horisontal space appears as 3 px.

Almost everytime I create a flash movie I get this problem. It could be in simple movie containing only one image, but the published swf file subtracts that one too :(

In the html I use "Dimensions: Match movie".

Anyone who knows this problem and could give me some help of great value? I would be delighted :)

PS. I downloaded Flash 8 Trial version and published the movie for Flash Player 8/ActionScript 2.0, and almost the same thing happened there... the height got correct, but the width of the movie still subtracts by 2 px :(