JavaScript - Treeview

Hi,

I need you help in javascript solution.

i have downloaded the treeview code from
http://thejit.org/static/v20/Jit/Exa...ple1.code.html

solution looks like:
http://thejit.org/static/v20/Jit/Exa.../example1.html

and need to modified it my reqirments are below:

1.When tree orientation is left, Diagram should start from left middle of the screen not from center.
2.When tree orientation is top, Diagram should start from top middle of the screen not from center.
3.When tree orientation is right, Diagram should start from right middle of the screen not from center.

can anybody help me in this?

thanks in advance.