title: Rails 3: Create new rails asset helper like image_tag that points to s3
body: <p>What would be the best way to create a new asset tag helper that would work the exact same way as image_tag, except pointed to s3?</p>
  
  <p>So I'd like this to happen:</p>
  
  <pre><code>image_path "foo.jpg" # =&gt; "/assets/foo.jpg" (default behavior)
  s3_image_path "bar.jpg" # =&gt; "http://site.s3.amazon.com/assets/bar.jpg"
  </code></pre>
  
  <p>Would the best way to do this be just to make a new helper in application_helper.rb?</p>