Sorry for the delay. No, no resizing deffect I see is another. If I disable the pluggin simply not resize the picture or the image map, I've tried before.
If you see the image link (http://i45.tinypic.com/hx9n5k.jpg) will see the 'hand' (cursor) is pointing outside the mapped area, however the related image appears ('Pepin'), because the 'image map' is not resized in the same proportion as the related image.
I noticed that this happens if the screen resolution is 1024x600, in my case (netbook). Decreasing the zoom below 100% on the same screen, the picture is well proportioned and also image map. In the same netbook, and Mozilla Firefox, this error does not occur.
With resolutions of 1280x1024 or more it does not, so I checked.
I tried two different netbooks and is exactly the same, so the conflict is almost certainly with Internet Explorer (in this case version 8). Maybe if you can try with a netbook can reproduce the defect that I explain.