slight left borderline in the browser

[Dezibel]

I exactly positioned the movie size to the picture size of that picture on frame 1. I positioned the picture to the upper left. But there still remains a very small border attached to the left side output of the flash object embedded in the html code. The "play in webbrowser" tool inside koolmoves shows the same borderline. Position the image at negative xoffset does not solve this problem.

What's the problem ?

Ulrich