title: How to change only text node in element
body: <p>I have next html:</p>
  <pre><code>&lt;label for=&quot;user_name&quot;&gt;
    &lt;abbr title=&quot;required&quot;&gt;*&lt;/abbr&gt;
    Name
  &lt;/label&gt;
  </code></pre>
  <p>And I want to change label caption to <code>Title</code> with jquery. So I do</p>
  <pre><code>$('label[for=user_name]').html('Title')
  </code></pre>
  <p>And it replaces all inner html (including <code>abbr</code> tag)</p>
  <p>So, what's the easiest way to replace only <code>Name</code>?</p>