JQuery and Google Maps API

<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
    <style type="text/css">
      html { height: 100% }
      body { height: 100%; margin: 0; padding: 0 }
      #map_canvas { height: 100% }
    </style>
    <script type="text/javascript"
      src="http://maps.googleapis.com/maps/api/js?key=AIzaSyDRSgWDqKjYgsJJKqBIfsQGpX4P_FxJLyg&sensor=false">
    </script>
    <script src="http://code.jquery.com/jquery-latest.js"></script>

    <script type="text/javascript">

    var directionsDisplay;
    var directionsService = new google.maps.DirectionsService();
    var map;
    var dist =0;

    function initialize() {
      directionsDisplay = new google.maps.DirectionsRenderer();
      var chicago = new google.maps.LatLng(41.850033, -87.6500523);
      var myOptions = {
        zoom:7,
        mapTypeId: google.maps.MapTypeId.ROADMAP,
        center: chicago
      }
      map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
      directionsDisplay.setMap(map);
    }

    $(document).ready(function(){
        $("#send").click(function(event){
            calcRoute();
            $("#result").html(dist);
        });

    });

    function calcRoute() {
      var start = document.getElementById("from").value;
      var end = document.getElementById("to").value;
      var ret = 0;
      var request = {
        origin:start,
        destination:end,
        travelMode: google.maps.TravelMode.DRIVING
      };
      directionsService.route(request, function(result, status) {
        if (status == google.maps.DirectionsStatus.OK) {
          directionsDisplay.setDirections(result);
          dist = result.routes[0].legs[0].distance.value;
        }else{
            alert("Error");
        }
      });

    }


    </script>
  </head>
  <body onload="initialize()">  <div>
        <input type="text" name="from" id="from"/><br />
        <input type="text" name="to" id="to"/><br />
        <a href="#" id="send">Get</a>
</div>
<div id="result"></div>
    <div id="map_canvas" style="width:50%; height:50%"></div>
  </body>
</html>