title: How do I change accordion header with plus and minus symbol?
body: <p>I don't like the default Accordion icons and I want to change them. This link here:</p>
  
  <p><a href="http://jqueryui.com/demos/accordion/#option-header" rel="noreferrer">http://jqueryui.com/demos/accordion/#option-header</a></p>
  
  <p>shows the option to change the header but it requires to specify icons. I don't need icons. I just need a simple <code>(+)</code> and <code>(-)</code></p>
  
  <p>How can I do that with accordions?</p>