How to place markers on google map

I use the google map tool from primefaces. I want my user to be able to place just one marker on a map. The values of the coordinates should be stored in a managed bean variables.

How can I do that? See what I did so far:

I created the map:

    <f:view contentType="text/html">
            <p:gmap id="gmap" center="36.890257,30.707417" zoom="13" type="HYBRID"   
    style="width:600px;height:400px"  
    model="#{mapBean.emptyModel}"   
    onPointClick="handlePointClick(event);"   
    widgetVar="map" />  </f:view>

<p:dialog widgetVar="dlg" effect="FADE" effectDuration="0.5" close="false" fixedCenter="true">  
    <h:form prependId="false">  
        <h:panelGrid columns="2">  
            <h:outputLabel for="title" value="Title:" />  
            <p:inputText id="title" value="#{mapBean.title}" />  

            <f:facet name="footer">  
                <p:commandButton value="Add"   
                        actionListener="#{mapBean.addMarker}"   
                        update="messages"   
                        oncomplete="markerAddComplete()"/>  
                <p:commandButton value="Cancel" onclick="return cancel()"/>  
            </f:facet>  
        </h:panelGrid>  

        <h:inputHidden id="lat" value="#{newOfferSupportController.mapLocationX}" />  
        <h:inputHidden id="lng" value="#{newOfferSupportController.mapLocationY}" />  
    </h:form>  
</p:dialog>  

<script type="text/javascript">  
    var currentMarker = null;  

    function handlePointClick(event) {  
        if(currentMarker == null) {  
            document.getElementById('lat').value = event.latLng.lat();  
            document.getElementById('lng').value = event.latLng.lng();  

            currentMarker = new google.maps.Marker({