title: How to bring the selected div on top of all other div's
body: <p>I have a bunch of divs on the screen.
  What I want to do is, when I select any div, I want its zIndex to be always higher than all other divs.</p>
  
  <p>In my application, i will need to do this repeatedly whenever I select a div, put it on top of others.</p>
  
  <p>Is this possible using Javascript?</p>