/*-------------------------------------------------------------------------------------------
|     ECOTree.js
|--------------------------------------------------------------------------------------------
| (c) 2006 Emilio Cortegoso Lobato
|     
|     ECOTree is a javascript component for tree drawing. It implements the node positioning
|     algorithm of John Q. Walker II "Positioning nodes for General Trees".
|    
|     Basic features include:
|       - Layout features: Different node sizes, colors, link types, alignments, separations
|                          root node positions, etc...
|       - Nodes can include a title and an hyperlink, and a hidden metadata.
|       - Subtrees can be collapsed and expanded at will.
|       - Single and Multiple selection modes.
|       - Search nodes using title and metadata as well.     
|     
|     This code is free source, but you will be kind if you don't distribute modified versions
|     with the same name, to avoid version collisions. Otherwise, please hack it!
|
|     References:
|                                                                
|     Walker II, J. Q., "A Node-Positioning Algorithm for General Trees"
|	     			   Software