Toggle visibility property of div

I have an HTML 5 video in a div. I then have a custom play button – that works fine.
And I have the video’s visibility set to hidden on load and visible when the play button is clicked, how do I return it to hidden when the play button is clicked again?

function showVid() {
  document.getElementById('video-over').style.visibility = 'visible';
}

#video-over {
  visibility: hidden;
  background-color: rgba(0, 0, 0, .7)
}

<div id="video-over">
  <video class="home-banner" id="video" controls="">
    <source src="http://video-js.zencoder.com/oceans-clip.mp4" type='video/mp4' />
    <source src="http://video-js.zencoder.com/oceans-clip.webm" type='video/webm' />
    <source src="http://video-js.zencoder.com/oceans-clip.ogv" type='video/ogg' />
    </video>
</div>

<button type="button" id="play-pause" onclick="showVid();">
      <img class="img-home-apply" src="/wp-content/images/apply-pic.png" alt="Apply Now">
      </button>

I’m basically just trying to toggle it between the two states of visible and hidden except I can’t use toggle because that show’s and hides the div. I need it there, just hidden, so it maintains the correct height.

Answer

Using jQuery:

$('#play-pause').click(function(){
  if ( $('#video-over').css('visibility') == 'hidden' )
    $('#video-over').css('visibility','visible');
  else
    $('#video-over').css('visibility','hidden');
});