like widget, use javascript take some data from host

[In someone's blog]
Here need send some request to our host
<script src='http://your_host/controller_name/action_name?q=2357,2388,2324&id=anything'></script>

that will become
params[:q] = '2357,2388,2324'
params[:id]= 'anything'

[Our controller ] 
We have to return javascript to do something like insert some content

 def action_name
   @element_id = params[:id]

   targets_id = [params[:q].split(',')].flatten.slice(0,2).compact
   targets = Target.find(:all, :conditions => { :target_id => targets_id})
    
    #@content is some data we want to insert it, and we encode it by function to_json,
    #content may have something that javascript may have some problems in handling
    #So, we encode all content by to_json  to javascript type data
   @content = render_to_string(:partial => 'content_partial', :locals => {:targets => targets}).to_json

   #we don't need layout
   render :layout => false

   #we should return javascript, so we change the header
   response.headers['Content-Type']='text/javascript'
 end

[View]
  this javascript will be received by your blog to do something like insert some content
(function(){
 var quote_data =<%= @content %>;
 document.write('<div id="<%= @element_id%>">'+quote_data+'</div>');
})();

[content_partial]
We use the id to make our css style would be unique
<style>
<% eid = "##{@element_id}" %>
<%=eid%> .scroll {
 background-image: url(http://host/public_inside/images/bg_scroll.gif);
 background-repeat: no-repeat;
 height: 8px;
 width: 268px;
 *width: 310px;
}
</style>

<div class="scroll" >
<MARQUEE direction="left" loop="true" scrollamount="4" scrolldelay="100" >
   <% targets.each do |t| -%>
     <a href="<%= back_link_url(:controller => 'target', :action => 'show', :id => t) %>" target="_blank">      
   </a>
   <% end -%>
 </MARQUEE>
</div>

[helper]
 #We should insert the complete url to link back
 def back_link_url(options)
   request.protocol + request.host_with_port + url_for(options)
 end