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REF:
http://stackoverflow.com/questions/9789546/need-to-add-directions-to-here-link-in-infowindow

working fiddle:
http://jsfiddle.net/haG2S/



<div id="map_canvas"></div>
<div id="directionsPanel"></div>


JS:
<script>
var geocoder;
var directionsService;
var directionsDisplay;

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
    });

    var infowindow = new google.maps.InfoWindow({
        content: "Your address: <input id='clientAddress' type='text'>"+
                "<input type='button' onClick=getDir() value='Go!'>"
    });

    google.maps.event.addListener(marker, 'click', function () {
        infowindow.open(map, marker);
    });
    geocoder = new google.maps.Geocoder();
    directionsService = new google.maps.DirectionsService();
    directionsDisplay = new google.maps.DirectionsRenderer({
        suppressMarkers: false
    });
    directionsDisplay.setMap(map);
    directionsDisplay.setPanel(document.getElementById("directionsPanel"));
}

function getDir() {
    geocoder.geocode({
        'address': document.getElementById('clientAddress').value
    },

    function (results, status) {
        if (status == google.maps.GeocoderStatus.OK) {
            var origin = results[0].geometry.location;
            var destination = new google.maps.LatLng(33.929011, -84.361);

            var request = {
                origin: origin,
                destination: destination,
                travelMode: google.maps.DirectionsTravelMode.DRIVING
            };

            directionsService.route(request, function (response, status) {
                if (status == google.maps.DirectionsStatus.OK) {
                    directionsDisplay.setDirections(response);
                }
            });

        } else {
            document.getElementById('clientAddress').value =
                "Directions cannot be computed at this time.";
        }
    });
}
initialize();
</script>