title: jQuery change existing img alt tag
body: <p>Simple question. I am trying to change all the image alt tags on my site using jQuery. The issue I'm having is that all my images have existing alt tags that I want to add to. Currently my code won't do anything, here is what I have placed just before closing the </p>
  
  <pre><code>&lt;script&gt;
  $("img").attr({
  alt: "This is some alt text"
  });
  &lt;/script&gt;
  </code></pre>
  
  <p>Can someone help me figure out what is wrong here. Thanks.</p>