cale.linear().range([0, w]);
	var y = d3.scale.linear().range([0, h]);
	var siblingColor = d3.rgb(header.style('background-color')).toString();
	var mouseoverColor = changeColorLuminance(siblingColor, 0.1);
	var root, node, overParent, overNode = null;

	var colorizeSibling = function(d) {
		if (d.children) {
			d.children.forEach(colorizeSibling);
		}

		if (d.rect && d.rect.style('fill') != siblingColor) {
			d.rect.style('fill', siblingColor);
			d.text.style('fill', getTextColor(siblingColor));
		}
	};
