title: jQuery - change value of attribute
body: <p>I don't know why this code not working good. I want change value of attribute "value" from "---" to "Day"</p>
  
  <pre><code>&lt;select name="0-birthdate_day" id="id_0-birthdate_day"&gt;
  &lt;option value="0"&gt;---&lt;/option&gt;
  &lt;/select&gt;
  
  $("#id_0-birthdate_day").children().eq(1).attr("value").replace('0', 'Day')
  </code></pre>
  
  <p>Thanks</p>