mhermans/graph.json

## graph.json
{"nodes":[{"label":"UA","group":1, "weight":10},{"label":"PSW","group":1, "weight":10},{"label":"FDC","group":1, "weight":10},{"label":"Faculteitsraad","group":1, "weight":10}],"links":[{"source":0,"target":1,"value":1},{"source":1,"target":2,"value":1}, {"source":1,"target":3,"value":1}]}

## index.html
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.js"></script>
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.layout.js"></script>
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.geom.js"></script>
<style type="text/css">
.link { stroke: #ccc; }
.nodetext { pointer-events: none; font: 10px sans-serif; }
</style>
</head>
<body>
<script type="text/javascript">

var w = 960,
    h = 500

var vis = d3.select("body").append("svg:svg")
    .attr("width", w)
    .attr("height", h);

d3.json("graph.json", function(json) {
    var force = self.force = d3.layout.force()
        .nodes(json.nodes)
        .links(json.links)
        .gravity(.05)
        .distance(100)
        .charge(-100)
        .size([w, h])
        .start();

    var link = vis.selectAll("line.link")
        .data(json.links)
        .enter().append("svg:line")
        .attr("class", "link")
        .attr("x1", function(d) { return d.source.x; })
        .attr("y1", function(d) { return d.source.y; })
        .attr("x2", function(d) { return d.target.x; })
        .attr("y2", function(d) { return d.target.y; });

    var node = vis.selectAll("g.node")
        .data(json.nodes)
      .enter().append("svg:g")
        .attr("class", "node")
        .call(force.drag);

    node.append("svg:image")
        .attr("class", "circle")
        .attr("xlink:href", "https://d3nwyuy0nl342s.cloudfront.net/images/icons/public.png")
        .attr("x", "-8px")
        .attr("y", "-8px")
        .attr("width", "16px")
        .attr("height", "16px");

    node.append("svg:text")
        .attr("class", "nodetext")
        .attr("dx", 12)
        .attr("dy", ".35em")
        .text(function(d) { return d.label });

    force.on("tick", function() {
      link.attr("x1", function(d) { return d.source.x; })
          .attr("y1", function(d) { return d.source.y; })
          .attr("x2", function(d) { return d.target.x; })
          .attr("y2", function(d) { return d.target.y; });

      node.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });
    });
});

</script>
</body>
</html>
	<!DOCTYPE html>
	<html>
	<head>
	<script type="text/javascript" src="http://mbostock.github.com/d3/d3.js"></script>
	<script type="text/javascript" src="http://mbostock.github.com/d3/d3.layout.js"></script>
	<script type="text/javascript" src="http://mbostock.github.com/d3/d3.geom.js"></script>
	<style type="text/css">
	.link { stroke: #ccc; }
	.nodetext { pointer-events: none; font: 10px sans-serif; }
	</style>
	</head>
	<body>
	<script type="text/javascript">

	var w = 960,
	h = 500

	var vis = d3.select("body").append("svg:svg")
	.attr("width", w)
	.attr("height", h);

	d3.json("graph.json", function(json) {
	var force = self.force = d3.layout.force()
	.nodes(json.nodes)
	.links(json.links)
	.gravity(.05)
	.distance(100)
	.charge(-100)
	.size([w, h])
	.start();

	var link = vis.selectAll("line.link")
	.data(json.links)
	.enter().append("svg:line")
	.attr("class", "link")
	.attr("x1", function(d) { return d.source.x; })
	.attr("y1", function(d) { return d.source.y; })
	.attr("x2", function(d) { return d.target.x; })
	.attr("y2", function(d) { return d.target.y; });

	var node = vis.selectAll("g.node")
	.data(json.nodes)
	.enter().append("svg:g")
	.attr("class", "node")
	.call(force.drag);

	node.append("svg:image")
	.attr("class", "circle")
	.attr("xlink:href", "https://d3nwyuy0nl342s.cloudfront.net/images/icons/public.png")
	.attr("x", "-8px")
	.attr("y", "-8px")
	.attr("width", "16px")
	.attr("height", "16px");

	node.append("svg:text")
	.attr("class", "nodetext")
	.attr("dx", 12)
	.attr("dy", ".35em")
	.text(function(d) { return d.label });

	force.on("tick", function() {
	link.attr("x1", function(d) { return d.source.x; })
	.attr("y1", function(d) { return d.source.y; })
	.attr("x2", function(d) { return d.target.x; })
	.attr("y2", function(d) { return d.target.y; });

	node.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });
	});
	});

	</script>
	</body>
	</html>