var loadData = 
{"name": "root", "children": [
   {"name": "A", "children": [
       {"name": "AA", "children": [
	      {"name": "AAA", "size": 2},
		  {"name": "AAB", "size": 1}
	   ]},
       {"name": "AB", "size": 1}]
       },  
  {"name": "B", "children": [
      {"name": "BA", "size": 1},
      {"name": "BB", "size": 1},
	  {"name": "BC", "size": 1}]
   },  
   {"name": "C", "children": [
      {"name": "CA", "size": 2},
      {"name": "CB", "size": 2}]
   }
]}
;