Simple line graph using d3.js

<!DOCTYPE html>
<meta charset="utf-8">
<style> /* set the CSS */

body { font: 12px Arial;}

path { 
  stroke: steelblue;
	stroke-width: 2;
	fill: none;
}

.axis path,
.axis line {
	fill: none;
	stroke: grey;
	stroke-width: 1;
	shape-rendering: crispEdges;
}

</style>
<body>

<!-- load the d3.js library -->	
<script src="http://d3js.org/d3.v3.min.js"></script>

<script>

// Set the dimensions of the canvas / graph
var	margin = {top: 30, right: 20, bottom: 30, left: 50},
	width = 600 - margin.left - margin.right,
	height = 270 - margin.top - margin.bottom;

// Parse the date / time
var	parseDate = d3.time.format("%d-%b-%y").parse;

// Set the ranges
var	x = d3.time.scale().range([0, width]);
var	y = d3.scale.linear().range([height, 0]);

// Define the axes
var	xAxis = d3.svg.axis().scale(x)
	.orient("bottom").ticks(5);

var	yAxis = d3.svg.axis().scale(y)
	.orient("left").ticks(5);

// Define the line
var	valueline = d3.svg.line()
	.x(function(d) { return x(d.date); })
	.y(function(d) { return y(d.close); });
    
// Adds the svg canvas
var	svg = d3.select("body")
	.append("svg")
		.attr("width", width + margin.left + margin.right)
		.attr("height", height + margin.top + margin.bottom)
	.append("g")
		.attr("transform", "translate(" + margin.left + "," + margin.top + ")");

// Get the data
d3.csv("data.csv", function(error, data) {
	data.forEach(function(d) {
		d.date = parseDate(d.date);
		d.close = +d.close;
	});

	// Scale the range of the data
	x.domain(d3.extent(data, function(d) { return d.date; }));
	y.domain([0, d3.max(data, function(d) { return d.close; })]);

	// Add the valueline path.
	svg.append("path")		// Add the valueline path.
		.attr("class", "line")
		.attr("d", valueline(data));

	// Add the X Axis
	svg.append("g")			// Add the X Axis
		.attr("class", "x axis")
		.attr("transform", "translate(0," + height + ")")
		.call(xAxis);

	// Add the Y Axis
	svg.append("g")			// Add the Y Axis
		.attr("class", "y axis")
		.call(yAxis);

});

</script>
</body>

date,close
1-May-12,58.13
30-Apr-12,53.98
27-Apr-12,67.00
26-Apr-12,89.70
25-Apr-12,99.00
24-Apr-12,130.28
23-Apr-12,166.70
20-Apr-12,234.98
19-Apr-12,345.44
18-Apr-12,443.34
17-Apr-12,543.70
16-Apr-12,580.13
13-Apr-12,605.23
12-Apr-12,622.77
11-Apr-12,626.20
10-Apr-12,628.44
9-Apr-12,636.23
5-Apr-12,633.68
4-Apr-12,624.31
3-Apr-12,629.32
2-Apr-12,618.63
30-Mar-12,599.55
29-Mar-12,609.86
28-Mar-12,617.62
27-Mar-12,614.48
26-Mar-12,606.98