Google Map API v2 to API v3

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#1
I have some code written to work with v2 of the maps API and I'm trying to write it to work with the v3 API but coming across a few stumbling blocks, I can add markers on a click event but I only ever want one marker on the map so if a second click on the map occurs it will remove the previous marker and a new marker at the location of the second click and so on, so there will only ever be one marker.

Any help is greatly appreciated.

v2 API code:
Code:
<script type="text/javascript">
    //<=!=[=C=D=A=T=A=[
    function createMarker(point, name)
    {
        var marker = new GMarker(point, {title:name});
        return marker;
    }
    
    function mapclick(ov,pt)
    {
        if (marker) map.removeOverlay(marker);
        if (pt) { marker = createMarker(pt,pt.toUrlValue());
                map.addOverlay(marker);
                }
        var matchll = /\(([-.\d]*), ([-.\d]*)/.exec(pt);
        if (matchll)
        {
            var lat = parseFloat( matchll[1] );
            var lon = parseFloat( matchll[2] );
            lat = lat.toFixed(6);
            lon = lon.toFixed(6);
        }
        document.getElementById("lat").value = lat;
        if(document.getElementById("lat").value == "undefined")
        {
            document.getElementById("lat").value = "";
        }
        document.getElementById("lon").value = lon;
        if(document.getElementById("lon").value == "undefined")
        {
            document.getElementById("lon").value = "";
        }
    }
    
    if (GBrowserIsCompatible()) 
    {
        var map=new GMap2(document.getElementById("map"));
        map.setCenter(new GLatLng(53.558584,-7.987061), 6);
        map.addControl(new GLargeMapControl());
        var marker = null;
        GEvent.addListener(map,\'click\',function(overlay,point){mapclick(overlay,point)});
    }
    //]=]=>
</script>
v3 API code(so far):
Code:
<script type="text/javascript">
    //<=!=[=C=D=A=T=A=[
    function initialize() {
        var latlng = new google.maps.LatLng(53.558584,-7.987061);
        var myOptions = {
            zoom: 6,
            center: latlng,
            mapTypeId: google.maps.MapTypeId.ROADMAP
        };
        var map = new google.maps.Map(document.getElementById("map_canvas"),myOptions);

        function addMarker(location) {
            marker = new google.maps.Marker({
                position: location,
                map: map
            });

            var matchll = /\(([-.\d]*), ([-.\d]*)/.exec(location);
            if (matchll)
            {
                var lat = parseFloat( matchll[1] );
                var lon = parseFloat( matchll[2] );
                lat = lat.toFixed(6);
                lon = lon.toFixed(6);
            }

            document.getElementById("lat").value = lat;
            if(document.getElementById("lat").value == "undefined")
            {
                document.getElementById("lat").value = "";
            }
            document.getElementById("lon").value = lon;
            if(document.getElementById("lon").value == "undefined")
            {
                document.getElementById("lon").value = "";
            }
        }

        google.maps.event.addListener(map, 'click', function(event) {
            addMarker(event.latLng);
        });

    }
    //]=]=>
</script>
 
#2
Figured it out, here it is if anyone needs if for anything.
Code:
<script type=\"text/javascript\">
    //<![CDATA[
    function initialize() {
        var latlng = new google.maps.LatLng(53.558584,-7.987061);
        var myOptions = {
            zoom: 17,
            center: latlng,
            mapTypeId: google.maps.MapTypeId.ROADMAP
        };
        var map = new google.maps.Map(document.getElementById(\"map_canvas\"),myOptions);
        var marker = null;

        function addMarker(location) {
            if (marker) marker.setMap(null);
            marker = new google.maps.Marker({
                position: location,
                map: map
            });

            var matchll = /\(([-.\d]*), ([-.\d]*)/.exec(location);
            if (matchll)
            {
                var lat = parseFloat( matchll[1] );
                var lon = parseFloat( matchll[2] );
                lat = lat.toFixed(6);
                lon = lon.toFixed(6);
            }

            document.getElementById(\"lat\").value = lat;
            if(document.getElementById(\"lat\").value == \"undefined\")
            {
                document.getElementById(\"lat\").value = \"\";
            }
            document.getElementById(\"lon\").value = lon;
            if(document.getElementById(\"lon\").value == \"undefined\")
            {
                document.getElementById(\"lon\").value = \"\";
            }
        }

        google.maps.event.addListener(map, 'click', function(event) {
            addMarker(event.latLng);
        });

    }
    //]]>
</script>
 
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