D3 Examples - Disease vs. War death

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<!DOCTYPE html>
<meta charset="utf-8">
<html>
<head>
<title>1900-2000: Infographic with the Century's Deaths</title>
<link rel="stylesheet" type="text/css" href="style.css" />
<script src="https://d3js.org/d3.v2.js"></script>
<script src="https://code.jquery.com/jquery-1.7.1.js"></script>
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<p id="chart">
<p id="rawdata">
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</head>
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<body>
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<script src="treemap.js"></script>
<script>
    function reSortRoot(root,value_key) {
        for (var key in root) {
            if (key == "key") {
                root.name = root.key;
                delete root.key;
            }
            if (key == "values") {
                root.children = [];
                for (item in root.values) {
                    root.children.push(reSortRoot(root.values[item],value_key));
                }
                delete root.values;
            }
            if (key == value_key) {
                root.value = parseFloat(root[value_key]);
                delete root[value_key];
            }
        }
        return root;
    }
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    $( document ).ready(function() {
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        d3.csv("data2.csv", function(csv_data){
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            // Add, remove or change the key values to change the hierarchy. 
      var nested_data = d3.nest()
                    .key(function(d)  { return d.cause; })
                    .key(function(d)  { return d.Subcause; })
              .key(function(d)  { return d.subsubcause; })
                      .entries(csv_data);
            
            var root = {};
            
            root.key = "Data";
            root.values = nested_data;
        
        
            root = reSortRoot(root,"deaths");
            
        
            
            loadData(root);
            
        });
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    });
</script>
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</body>
<footer>
<h1><br><br><br><br><br><br>
    20th Century Deaths</h1>
    <p>1900-2000: Infographic of a Century's Death Toll: <br>Ever wondered why people die? Well, here is a complete overview of the estimated deaths for the time-period 1900 - 2000. <br>The data comes from David McCandless's public data collection efforts, and can be accessed<a href="https://docs.google.com/spreadsheet/ccc?key=0Aqe2P9sYhZ2ndDFON0Zidmh0ZHc1WGU4NHMzQ1AtMVE#gid=8"> here</a> (2015).</p>
</footer>
</html>
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