title: Unload CSS from webpage
body: <p>Am wondering how it would be possible to unload a CSS from a page. e.g. In my page I have included a file called a.css. Now I want the user to be able to change the theme, which is CSS driven, thus he/she should be able to unload a.css and then I can load b.css (else they will conflict)</p>
  
  <p>Any idea how to go about this?</p>