Load Content on Page Load

application.js

/* Assuming that jQuery is already loaded */
$(document).ready(function() {
  /* Ajax Content Load */
  $('.ajax_content_loader').click();
})

application_helper.rb

module ApplicationHelper
  def ajax_content_loader(url)
    link_to(image_tag("/images/layout/ajax-loader.gif"), url, :remote => true, :class => "ajax_content_loader")
  end
end

index.html.erb

<%# *Some thing else %>

<div id="activity_feed">
  <%= ajax_content_loader(load_activity_path) %>
</div>

<%# *Some thing else %>

load_activity.js.erb

$('#activity_feed').html('<%= escape_javascript render(:partial => "activities/feed", :locals => {:activities => @activities}) %>')