Rails 2.3 override of gmaps4rails partial

_gmaps4rails.html.erb

<% #thanks to enable_css, user can avoid this css to be loaded
if enable_css == true %>
	<% content_for :head do %>
	<%= stylesheet_link_tag 'gmaps4rails' %>
	<% end %>
<% end %>
<% content_for :scripts do %>
<% if enable_js == true %>
  <% @provider = options['map_options'] && options['map_options']['provider'] ?  options['map_options']['provider'] : nil -%>
  <% case @provider
        when "openlayers" %>
    <script src="http://www.openlayers.org/api/OpenLayers.js"></script>
  <% when "mapquest" %>
    <script src="http://mapquestapi.com/sdk/js/v6.0.0/mqa.toolkit.js?key=#{options['map_options'].try(:[], 'provider_key')}"></script>
  <% when "bing" %>
    <script type="text/javascript" src="http://ecn.dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=7.0"></script>
  <% else %>
    <script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false&amp;libraries=geometry<%= g_libraries(options['map_options'].try(:[], 'libraries')) %>"></script>
    <script type="text/javascript" src="http://google-maps-utility-library-v3.googlecode.com/svn/tags/infobox/1.1.5/src/infobox.js"></script>
    <script type="text/javascript" src="http://google-maps-utility-library-v3.googlecode.com/svn/tags/markerclusterer/1.0/src/markerclusterer_compiled.js"></script>
  <% end %>
  
  <%= javascript_include_tag 'gmaps4rails/gmaps4rails.base.js' %>
  <% case @provider
     when "openlayers" %>
      <%= javascript_include_tag 'gmaps4rails/gmaps4rails.openlayers.js' %>
    <% when "mapquest" %>
      <%= javascript_include_tag 'gmaps4rails/gmaps4rails.mapquest.js' %>
    <% when "bing" %>
      <%= javascript_include_tag 'gmaps4rails/gmaps4rails.bing.js' %>
    <% else %>
      <%= javascript_include_tag 'gmaps4rails/gmaps4rails.googlemaps.js' %>
    <% end %>
  <% end %>

<script type="text/javascript" charset="utf-8">
function gmaps4rails_init() {
  <% #true is passed here to trigger map initialization %>
  <%=raw options.to_gmaps4rails(true) %>
};

window.onload = gmaps4rails_init;

</script>
<% end %>


<% case @provider
   when "mapquest" %>
<div id="mapQuest" style="width:750px; height:475px;">
  <!-- TODO: change this style dynamically -->  
</div>
<% else  %>
<% container_id = options['map_options'] &&  options['map_options']['container_id'] ? options['map_options']['container_id'] : 'map_container' -%>
<% inner_id = options['map_options'] && options['map_options']['id'] ?  options['map_options']['id'] : 'gmaps4rails_map' -%>
<div id="<%= container_id -%>" > 
  <div id="<%= inner_id  -%>"<%= ' class="bing_map"'  if @provider == 'bing' -%>></div>
</div>
<% end %>

Note that this was written pre-1.0.0 release of gmaps4rails, it will likely need tweaking for you.

And here's a link to the latest version of gmaps4rails version for reference: https://github.com/apneadiving/Google-Maps-for-Rails/blob/master/app/views/gmaps4rails/_gmaps4rails.html.erb