Ym4r user - Mar 2008 - problem with rjs and marker group

Lo there all,

i have a function that builds a bunch of markers to go on a google
map. I would like to update them with rjs.
Here is what i have so far.

def map_main_layout
      @zoom = params[:zoom].to_i
      @zoom = 14 if params[:zoom].nil?

      @map = GMap.new("map_div")
      # @map.control_init(:large_map => true, :map_type => true) #
(inserts map control)
      # place the map where we want it ( center and zoom level )
      @map.center_zoom_init([@group.group_map_stat.lat.to_f,
@group.group_map_stat.long.to_f], @zoom)
      @map.set_map_type_init(GMapType::G_HYBRID_MAP)
      @sites = @group.sites
      @sites.each do |site|
        # draw the circles
        site.map_stat.circle_image(@zoom)
      end
      @all_markers = make_map_markers(@sites, @zoom)
      @map.overlay_global_init(GMarkerGroup.new(true,  @all_markers),
"myGroup")
    end

    def make_map_markers(sites, zoom)
      _all_markers = Hash.new
      sites.each_with_index do |site, i|
        # load the circles
          text = site.map_stat.marker_window_html()

          # r = site.map_stat.radius.to_i
          zoomhash = {13 => 0.5, 14 => 1, 15 => 2, 16 => 4}
          r = (site.map_stat.radius.to_f * zoomhash[@zoom.to_i].to_f).to_i

          # title tooltip for the image
          title = "%s %s => %s" % [@group.name, site.site_name,
(KeyWord.stat_description(site.status_sensor.last_value)[0])]

          # create the icon image ( the pivot circle )
          icon = GIcon.new(:image => "/images/tmp/#{site.id}.png",
:icon_size => GSize.new((r*2),(r*2)),
                           :icon_anchor => GPoint.new(r,r),
:info_window_anchor => GPoint.new(r,r))

          # place the marker on the map
          marker = GMarker.new([site.map_stat.lat.to_f ,
site.map_stat.long.to_f],
                           :title => title, :icon => icon, :info_window
=> text)
          _all_markers[i] = marker
      end
      return _all_markers
    end


def update_map_markers
       @zoom = params[:zoom].to_i
       @zoom = 14 if params[:zoom].nil?

       @map = Variable.new("map")
       @all_markers = Variable.new("myGroup") # the actual marker
group, not the markers, this is the container

       @group.sites.each { |site| site.map_stat.circle_image(@zoom)}
       @site_marks = make_map_markers(@group.sites, @zoom)
       @marker = GMarker.new([75.89,-42.767],:title => "Update",
:info_window => "I have been placed through RJS")
    end


I am using a simple form_remote_tag in the view, and in the rjs file i have
page << @map.clear_overlays
@site_marks.each {|mark| page << @map.add_overlay(mark)}

now, when i execute the button, the markers go away, but are not redrawn.
Anybody help me please ?

thanks again
shawn