Jquery, Given a string and its coordinates replace it
<p>I have a string like that:</p>

<blockquote>
  <p>I'm a string not too long but neither so short</p>
</blockquote>

<p>Let's take the word 'not' inside the string: it starts at position number 13 and it ends at position numer 16.</p>

<p>There's a way with JQuery to substitute the word between position 13 and position 16 with this:</p>

<pre><code>&lt;b&gt;not&lt;/b&gt;
</code></pre>

<p>I know only the position of the string that i want to replace not it's content.</p>
