geojson - Leaflet Marker Mouseover Popup

I've tried to make a MouseOver Markers Popup since a couple of days, I'm using Leaflet. I know some solutions I've read in many forums, but I wanna make it work with GeoJSON-Points and I haven't found a solution yet.

Here is a working example, for click popups only:

$('#map').each(function () {
    // map initialization
    map = new L.map('map');

    var gjsonMarker = [{
        "type": "Feature",
        "properties": {
            "name": "start",

            "popupContent": "Portoferraio"
        },
        "geometry": {
            "type": "Point",
            "coordinates": [10.3163552, 42.8072368, 0.0]
        }
    },
    {
        "type": "Feature", "properties": { "name": "stop", "popupContent": "Marciana Marina" },
        "geometry": { "type": "Point", "coordinates": [10.1970935, 42.8069535, 0.0] }

    },
    {
        "type": "Feature", "properties": { "name": "stop", "popupContent": "Bastia" },
        "geometry": { "type": "Point", "coordinates": [9.4520402, 42.6943563, 0.0] }
    },
    {
        "type": "Feature", "properties": { "name": "stop", "popupContent": "Campoloro" },
        "geometry": { "type": "Point", "coordinates": [9.5417333, 42.3393521, 0.0] }
    },
    {

        "type": "Feature", "properties": { "name": "stop", "popupContent": "Cavo" },
        "geometry": { "type": "Point", "coordinates": [10.422377586, 42.859476028, 0.0] }
    }];

    gpsMarker = new L.geoJson(gjsonMarker, {
        onEachFeature: function(feature, layer) {
            if (feature.properties && feature.properties.popupContent) {
                layer.bindPopup(feature.properties.popupContent, {closeButton: false});
            }
        },

        pointToLayer: function (feature, latlng) {
            return L.circleMarker(latlng);
        }
    });

    map.addLayer(gpsMarker);
    map.fitBounds(gpsMarker.getBounds(), {padding: [0, 0]});
});

Any ideas how to make the Popup with MouseOver effect, and when I leave the point the popup must be hidden again.

Greets!