controller

def stuff
       current_site = Site.find params[:id]
       session[:site] = current_site
       Site.update current_site, :default => 1
       back_sites = Site.find_by_sql("SELECT sites.* FROM sites WHERE id != #{current_site.id} AND user_id = #{@user.id}")
       back_sites.each do |s|
           Site.update s, :default => 0
       end
       render :nothing => :true
end

javascript + ruby

<script type="text/javascript">
				function delayedRedirect(leader){
				    window.location = "/veeo/site/" + leader
				}
				function morphing(leader){
					<% sites.each do |s| %>
						if(<%= s.id %> == leader){
							new Effect.Morph('cursor_<%= s.id %>', {style: {marginLeft: '55px'}, duration: 0.5});
							$('cursor_zone_<%= s.id %>').setStyle({backgroundImage:'url(/images/veeo/cursor/bg_on.png)'});
						} else {
							new Effect.Morph('cursor_<%= s.id %>', {style: {marginLeft: '0px'}, duration: 0.5});
							$('cursor_zone_<%= s.id %>').setStyle({backgroundImage:'url(/images/veeo/cursor/bg_off.png)'});
						}
					<% end %>
					setTimeout('delayedRedirect(' + leader + ')', 2000);
				}
			</script>

rhtml view

<% sites.each do |s| %>
				<li>
					<%
						if @site.id == s.id
							bg_img = "bg_on"
							cursor_style = "position: absolute; margin-left: 55px"
						else
							bg_img = "bg_off"
							cursor_style = "position: absolute; margin-left: 0px"
						end
					%>
					<span style="cursor: pointer; float: right; width: 94px; height: 27px; display: block; background: url(/images/veeo/cursor/<%= bg_img %>.png); margin-top: -5px" id="cursor_zone_<%= s.id %>" onclick="<%= remote_function :url => {:controller => "veeo", :action => "activate_site", :id => s.id}, :success => "morphing(#{s.id})" %>" class="temp_site">
						<%= image_tag("/images/veeo/cursor/cursor.png", :style => "#{cursor_style}", :id => "cursor_#{s.id}") %>
					</span>
					<%= link_to s.nom, :action => "site", :id => s.id %>
				</li>
			<% end %>