title: Get the header text of all collapsible header in jquery mobile
body: <p>I have used collapsible in my project. Here i want to get collapsible header value.
  sample code is shown here</p>
  
  <pre><code>&lt;div data-role="collapsible" data-collapsed="true"  data-theme="a" data-content-theme="a"&gt;
  &lt;h3&gt;HEADER1&lt;/h3&gt;
  &lt;/div&gt;
  &lt;div data-role="collapsible" data-collapsed="true"  data-theme="a" data-content- theme="a"&gt;
  &lt;h3&gt;HEADER2&lt;/h3&gt;
  &lt;/div&gt;                                                      
  &lt;div data-role="collapsible" data-collapsed="true"  data-theme="a" data-content-theme="a"&gt;
  &lt;h3&gt;HEADER3&lt;/h3&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>Now i need all collapsible header should store in an array like this</p>
  
  <pre><code>var h3Text={"HEADER1", "HEADER2", "HEADER3"};
  </code></pre>