Possible to use rails for a popup?

From Rails API Docs, link_to Examples:

link_to "Busy loop", { :action => "busy" }, :popup => ['new_window',
'height=300,width=600']

'height=300,width=600' is a string of JavaScript Propertiesfor the
Popup, so you can define other JavaScript Properties for the popup as
well.

then define the "busy" action in your controller, and render a view for
it.
you might want to define a different layout for the popup as it should
not use your default template with navigation and stuff ...

def busy
  ...do stuff here...
  render :action => :busy, :layout => :popup
end

3) then create

3.1) a popup.rb in your app/views/layout folder for the popup with the
basic HTML strcuture (like you do in the application.rhtml layout and
<%= content_for_layout %>
you can re-use this layout for other popups...
3.2) a busy.rhtml view in the view/yourcontroller directory, which will
render the content for the popup layout ....