<script type="text/javascript">
 
//now add markers
 @foreach (var item in Model) {
    <text>
      var markerlatLng = new google.maps.LatLng(@(Model.Latitude), @(Model.Longitude));
      var title = '@(Model.Title)';
      var description = '@(Model.Description)';
      var contentString = '<h3>' + title + '</h3>' + '<p>' + description + '</p>'
 
      var infowindow = new google.maps.InfoWindow({
          content: contentString
      });
 
      var marker = new google.maps.Marker({
          position: latLng,
          title: title,
          map: map,
          draggable: false
      });
 
      google.maps.event.addListener(marker, 'click', function () {
          infowindow.open(map, marker);
      });
 
   </text>
      }
</script>

<script type="text/javascript">
 
//some javascript code here to display map etc
...
//declare addMarker function
function addMarker(latitude, longitude, title, description)
{
      var markerlatLng = new google.maps.LatLng(@(Model.Latitude), @(Model.Longitude));
      var title = '@(Model.Title)';
      var description = '@(Model.Description)';
      var contentString = '<h3>' + title + '</h3>' + '<p>' + description + '</p>'
 
      var infowindow = new google.maps.InfoWindow({
          content: contentString
      });
 
      var marker = new google.maps.Marker({
          position: latLng,
          title: title,
          map: map,
          draggable: false
      });
 
      google.maps.event.addListener(marker, 'click', function () {
          infowindow.open(map, marker);
      });
}
 
//now add markers
 @foreach (var item in Model) {
     @:addMarker(@item.Latitude, @item.Longitude, '@item.Title', '@item.Description');
 }
</script>