title: Need to add "directions to here" link in infowindow
body: <p>I'm new to both Google Maps and Javascript but have to get this issue solved! I have an .html file with a google map of our client's location loaded into the map_canvas div. Through tutorials, I have been able to figure out how to write enough Javascript to get the map to function, have a custom marker and and infowindow that pops up when you click on it. The only part left is to have a link inside the infowindow that says "directions to here" and there's a text field that the user can type in their starting address. I'm seeing plenty of documentation to help me write my own code on the Google Developer's site but I am  not advanced enough to do this. Can anyone help me figure out how to do this? Here is my Javascript:</p>
  
  <pre><code>&lt;script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"&gt;&lt;/script&gt;
  &lt;script type="text/javascript"&gt;
  function initialize()
  {
      var latlng = new google.maps.LatLng(33.929011, -84.361);
      var myOptions = {
          zoom: 15,
          center: latlng,
          mapTypeId: google.maps.MapTypeId.ROADMAP
      };
  
      var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
  
      var marker = new google.maps.Marker({
          position: new google.maps.LatLng(33.929011, -84.361),
          map: map,
          title: 'Atlanta/Sandy Springs',
          clickable: true,
          icon: 'images/mapmarker.png'
      });
  
      var infowindow = new google.maps.InfoWindow({
        content: 'client address'
      });
  
      google.maps.event.addListener(marker, 'click', function() {
        infowindow.open(map, marker);
      });
  
  }
  &lt;/script&gt;
  </code></pre>