ToolTip.js
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	/**
	* @requires javelin-install
	* javelin-util
	* javelin-dom
	* javelin-vector
	* @provides phabricator-tooltip
	* @javelin
	*/

	JX.install('Tooltip', {

	statics : {
	_node : null,

	show : function(root, scale, align, content) {
	if (__DEV__) {
	switch (align) {
	case 'N':
	case 'E':
	case 'S':
	case 'W':
	break;
	default:
	JX.$E(
	"Only alignments 'N' (north), 'E' (east), 'S' (south), " +
	"and 'W' (west) are supported."
	);
	break;
	}
	}

	var node = JX.$N(
	'div',
	{ className: 'jx-tooltip-container jx-tooltip-align-' + align },
	[
	JX.$N('div', { className: 'jx-tooltip' }, content),
	JX.$N('div', { className: 'jx-tooltip-anchor' })
	]);

	node.style.maxWidth = scale + 'px';

	JX.Tooltip.hide();
	this._node = node;

	// Append the tip to the document, but offscreen, so we can measure it.
	node.style.left = '-10000px';
	document.body.appendChild(node);

	var p = JX.$V(root);
	var d = JX.Vector.getDim(root);
	var n = JX.Vector.getDim(node);

	// Move the tip so it's nicely aligned.

	switch (align) {
	case 'N':
	node.style.left = parseInt(p.x - ((n.x - d.x) / 2)) + 'px';
	node.style.top = parseInt(p.y - n.y) + 'px';
	break;
	case 'E':
	node.style.left = parseInt(p.x + d.x) + 'px';
	node.style.top = parseInt(p.y - ((n.y - d.y) / 2)) + 'px';
	break;
	case 'S':
	node.style.left = parseInt(p.x - ((n.x - d.x) / 2)) + 'px';
	node.style.top = parseInt(p.y + d.y + 5) + 'px';
	break;
	case 'W':
	node.style.left = parseInt(p.x - n.x - 5) + 'px';
	node.style.top = parseInt(p.y - ((n.y - d.y) / 2)) + 'px';
	break;
	}
	},

	hide : function() {
	if (this._node) {
	JX.DOM.remove(this._node);
	this._node = null;
	}
	}
	}
	});

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