title: jquery Setting option selected with known value
body: <p>I have the next select:</p>
  
  <pre><code>&lt;select name="priority" id="priority" class="update_priority"&gt;
      &lt;option value="root" label="Without parent"&gt;Without parent&lt;/option&gt;
      &lt;option value="72" label="Rank3"&gt;Rank3&lt;/option&gt;
      &lt;option value="71" label="Rank1"&gt;Rank1&lt;/option&gt;
      &lt;option value="67" label="Rank2"&gt;Rank2&lt;/option&gt;
      &lt;option value="64" label="Rank4"&gt;Rank4&lt;/option&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p>In JS i have a variable with something value. For example: </p>
  
  <pre><code>selected = 71;
  </code></pre>
  
  <p>Now, with help of jQuery I want to make option selected with this value(in our example 71).</p>