update marker on gmap v3 in a particular time interval

update marker on gmap v3 in a particular time interval

Hi 
  I try to update the marker location on gmap from the json for every 10 seconds. but it draw marker on new location without remove the old one and also i want to show all the marker including client position, when i use bounds:true it only show all marker from json but it does not include client location. how do i do it? my code is below, 

Any help will be appreciated.

function routemap() {
var v_buses = JSON.parse(window. localStorage.getItem("buses"));//list of valid bus numbers
var v_routeno = JSON.parse(window. localStorage.getItem("routeno"));//list of valid route numbers
var v_routes = JSON.parse(window. localStorage.getItem("routes"));//list of valid routes
        $('#map_canvas').gmap(' getCurrentPosition',function(position,status) {
                //client position get value from gps
                 if ( status === 'OK' ) {
                       var clientPosition = new google.maps.LatLng(position. coords.latitude, position.coords.longitude);
                        $('#map_canvas').gmap({ 'zoom':14, 'center':clientPosition});
                        $('#map_canvas').gmap(' addMarker',{'position': clientPosition, 'icon':"images/male-2.png"}).click(function() {
                             $('#map_canvas').gmap(' openInfoWindow', {'content': 'your location', draggable:true}, this)
                        });
                  }
         else {
alert("position error");
}
          });

  setInterval(function () {
for(var i = 0; i < v_buses.length; i++) {
var id = v_buses[i];
var bno=v_routeno[i];
var route=v_routes[i];
                $.getJSON('/route/'+id+'/'+ bno+'/'+route,function(data){
          if(data.status == 'ok'){
                                   $.each( data.markers, function(i, marker) {
  $('#map_canvas').gmap(' refresh');
                                        $('#map_canvas').gmap(' addMarker', {
                                          'position': new google.maps.LatLng(marker. latitude, marker.longitude),
                                            'bounds': true,
                                             'icon':"images/bus2.png" }).click(function() {
                                                $('#map_canvas').gmap(' openInfoWindow', { 'content': 'Bus no: '+data.bno+'<br>Route: '+data.route }, this);
                                           });
                              });
     }
                  });
}
   },10000);
}