Found this Free webiste online that i want to customize but i cant change the default zoom lvl, i dont know javascript. I would like to know what lines of code i need to add in order to change the zoom lvl. Thanks, :=), also i dont know if i have to include other code/info here, just tell me if you need more info.
    <!-- Footer -->
    <footer>
        <!-- Container -->
        <div class="container">
            <div class="row">
            </div>
        </div><!-- Container end -->
    </footer><!-- Footer end -->
    <!-- scroll up-->
    <div class="scrollup">
        <a href="#"><i class="fa fa-chevron-up"></i></a>
    </div><!-- End off scroll up->
    <!-- JavaScript -->
    <script src="http://code.jquery.com/jquery-1.12.1.min.js"></script>     
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
    <!-- Bootsnav js -->
    <script src="js/bootsnav.js"></script>
    <!-- JS Implementing Plugins -->
    <script src="http://maps.google.com/maps/api/js?sensor=true"></script>
    <script src="js/gmaps.min.js"></script>
    <script type="text/javascript">
        var map;
        $(document).ready(function () {
            map = new GMaps({
                el: '#ourmaps',
                lat: 15, 
                lng: 15,
                scrollwheel: true
            });
            //locations request
            map.getElevations({
                locations: [[15, 15]],
                callback: function (result, status) {
                    if (status == google.maps.ElevationStatus.OK) {
                        for (var i in result) {
                            map.addMarker({
                                lat: result[i].location.lat(),
                                lng: result[i].location.lng(),
                                infoWindow: {
                                    content: '<address class="tooltip_address"><b>aaaa</b><br />aaa<br />aaaa<br />aaaa <br /></address>'
                                }
                            });
                        }
                    }
                }
            });
        });
    </script>
    <!--main js-->
    <script type="text/javascript" src="js/main.js"></script>