"Week 10, Small Multiples."

body {
  font: "Open Sans", Helvetica, sans-serif;
}

.container {
  width: 1050px;
}
h1 {
  weight: 600;
  font-size: 26px;
  padding: 0px 0 5px 0;
  line-height: 1.2em;
  color: #000;
  margin-bottom: 0px;
}
#lead {
  clear: both;
  width: 600px;
}
#lead p {
  color: #444;
  font-family: Georgia, "Palatino", serif;
  font-size: 1.0em;
  line-height: 1.4em;
}
.chart {
  float: left;
  padding-right: 5px;
  padding-bottom: 5px;
  padding-top:0;
  padding-left:0;
}
svg {
  font-size: 9px;
  font-weight: 300;
}
.background {
  fill: none;
}
.area {
  fill: #D6C789;
  opacity: 0.5;
}
.line {
  fill: none;
  stroke: #696141;
  stroke-width: 0.7px;
}
.title {
  font-size: 12px;
}
.axis line, .grid line {
  stroke-width: .5px;
  shape-rendering: crispEdges;
  stroke: #fff;
  opacity: 0.5;
  pointer-events: none;
}
.axis path {
  display: none;
}
.hidden {
  display:none;
  opacity: 0.0;
}
#button-wrap {
  width: 220px;
  margin-left: auto;
  margin-right: auto;
  height: 40px;
  margin-bottom: 10px;
  padding-left: 5px;
}
.button {
  cursor: pointer;
  float: left;
  width: 100px;
  height: 30px;
  text-align: center;
  background: #fcfcfc;
  border: 1px solid #cecece;
  display: block;
  padding-top: 5px;
  margin-top: 10px;
  border-radius: 5px 5px 5px 5px;
}
.button.active {
  box-shadow: inset 0px 0px 7px rgba(0,0,0,0.18);
  pointer-events: none;
  background-color: rgba(230,222,182,0.5);
}
#count {
  border-radius: 5px 0px 0px 5px;
}
#name {
  border-radius: 0px 5px 5px 0px;
}
</style>

</head>

<body>

<div class="container">
    <h1>Deaths in children aged under 5 (per 1,000 live births), caused by diarrhoeal diseases</h1>
    <div id="lead">
      <p>Data Source: WHO.</p>
    </div>
    <div id="main">
      <div id="button-wrap">
        <div id="count" class="button active">COUNT</div>
        <div id="country" class="button">COUNTRY</div>
      </div>
      <div id="vis"></div>
    </div>
  </div>

var width = 150;
  var height = 120;
  var margin = { top: 15, right: 20, bottom: 40, left: 40 };

var data = [];
  var circle = null;
  var caption = null;
  var curYear = null;

var bisect = d3.bisector(function(d) {
    return d.date;
  }).left;

var format = d3.time.format("%Y");
  var xScale = d3.time.scale().range([0, width]);
  var yScale = d3.scale.linear().range([height, 0]);
  var xValue = function(d) {
    return d.date;
  };

var yValue = function(d) {
   return d.count;
 };

var yAxis = d3.svg.axis()
    .scale(yScale)
    .orient("left")
    .ticks(3)
    .outerTickSize(0)
    .tickSubdivide(1)
    .tickSize(-width);

maxY = maxY + (maxY * 1 / 4);
    yScale.domain([0, maxY]);
    extentX = d3.extent(data[0].values, function(d) {
      return xValue(d);
    });
    return xScale.domain(extentX);
  }

d3.csv("diarrhoeal.csv", function(error, rawData) {
    if (error) {
      console.log(error);
    };

function mouseover() {
       circle.attr("opacity", 1.0);
       d3.selectAll(".static_year").classed("hidden", true);
       return mousemove.call(this);
     };

</script>

</body>
</html>

Modified http://code.jquery.com/jquery-1.7.2.min.js to a secure url

https://code.jquery.com/jquery-1.7.2.min.js

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js