CHANGELOG:
 v.0.6
   added drag & drop between trees with correct marker placement
   optimized jQuery selectors
   added cut/copy/paste + oncopy callback
   added error callback - attach custom function to errors
   added multiple selection with move & delete
   added getJSON - return the tree as an object
   added before handlers
   optimized css, added 'leaf' class
   added basic rtl support (user opinions?)
   added cookie support with definable prefix and options - default is false
   added if selected node is within closed parent - select parent
   added CSS solution when dragging large sets - all inner nodes are closed while dragging
   added solid background color option (not white) - set background color on "li.last", ".tree"
   added animation support (slideUp/slideDown) - specify duration (disabled for msie 6 - slow)
   updated listen plugin
   updated sarissa
   added insertAt option for creating nodes ('top' or 'bottom')