Create a fractal tree What I would like to see is a fractal tree being drawn where the you can input an integer, and the output will be a fractal tree with the entered amount of branch steps.

Rules:


The fractal should be a line fractal tree: 
the shape of the fractal should also be the same as this picture.
Each branch should decrease by 25% in width for each time it splits
The final layer of branches should be an 1px wide line
Shortest code wins


Tip: this site might be useful.
Context Free, 82 65 57 characters

rule T{9*[y 1]SQUARE[]2*{f 90}T{s.75y 8r 25}}startshape T




See: http://www.contextfreeart.org/gallery/view.php?id=3384

Golf'd further with help from Context Free Art users minimaleye, MtnViewJohn, and kipling.