Google Map v3 auto refresh Markers only

I'm using Google Maps V3 to display some pins. I want to be able to refresh markers without affecting where you're at on the map or the zoom level. I want the markers to be updated every x seconds.

How would I go about doing this? I don't have that much experience with jQuery/ajax.

A working example of my map is below.

http://jsfiddle.net/dLWNc/

 var locations = [
  ['some random info here', -37.8139, 144.9634, 1],
  ['some random info here', 46.0553, 14.5144, 2],
  ['some random info here', -33.7333, 151.0833, 3],
  ['some random info here', 27.9798, -81.731, 4],    ];


var map = new google.maps.Map(document.getElementById('map_2385853'), {
  zoom: 1,
  maxZoom: 8, 
  minZoom: 1, 
  streetViewControl: false,
  center: new google.maps.LatLng(40, 0),
  mapTypeId: google.maps.MapTypeId.ROADMAP
});

var infowindow = new google.maps.InfoWindow();

var marker, i;

for (i = 0; i < locations.length; i++) {  
  marker = new google.maps.Marker({
    position: new google.maps.LatLng(locations[i][1], locations[i][2]),
    map: map
  });

  google.maps.event.addListener(marker, 'click', (function(marker, i) {
    return function() {
      infowindow.setContent(locations[i][0]);
      infowindow.open(map, marker);
    }
  })(marker, i));
}

Thank you