anchor.diff:  	if (d.parent) {}
   
   	if (d.fullname) {
  -		div.transition()
  +		treenode_tip.transition()
   			.duration(200)
   			.style("opacity", .8);
   	}
  
positive.code: var barHeight = 20,
  	barWidth;
  
  var div;
  
  var tree = d3.layout.tree().size([treeviewHeight, 100]);
  
  
negative.code: 
  function onMouseMove(d) {
  	if (d.fullname) {
  		treenode_tip.text(d.fullname)
  		//.style("width", x(txt))
  		.style("left", (d3.event.pageX) + "px")
  			.style("top", (d3.event.pageY + 18) + "px");
  