preview.rhtml

<h1><%= flash[:message] %></h1>
<div style="border: 3px solid #000">
  <iframe src="<%= @preview_url %>" width="800px" height="600px" scrolling="yes"></iframe>
    <div style="text-align: center">
      [ <%= link_to_remote('Edit Again', {
    			:update => 'main',
    			:url => { :action => 'edit', :id => @page_id,} }
    			) %> ] 
    			[ <a href="<%= @preview_url %>">Full Screen</a> ]
    </div>
</div>