var playing=0;

var cells = document.querySelectorAll("[id^='media']");
for (var i = 0; i < cells.length; i++)
{
 cells[i].addEventListener('mouseenter', DoTheThing, {passive: true}, false);
 cells[i].addEventListener('touchstart', DoTheThing, {passive: true}, false);
 cells[i].addEventListener('mouseleave', BringBack, {passive: true}, false);
}


function DoTheThing()
{

if (playing==this.id)
 { BringBack(); return; }

var elem=document.getElementById('preview-video');
if (elem!=null) {   BringBack();    elem=null;  }  
if (elem==null)
 {
  const video = document.createElement('video');
  video.autoplay = "true";
  video.preload = "true";
  video.loop="true";
  video.muted = true;
  video.id = "preview-video";
  
  video.setAttribute("muted", "true");
  video.setAttribute("playsinline", "true");
  video.setAttribute("type", "video/mp4");
  video.setAttribute("src", this.getAttribute('data-video'));
  $img = this.getElementsByTagName('img')[0].src;
  video.setAttribute("style","display : block; background :  url(/js/load_bar_preview.gif) center 98% / 96% 4px no-repeat, url("+ $img +") center center / 99% 99% no-repeat");


  document.getElementById(this.id).appendChild(video);
  document.getElementById(this.id).getElementsByTagName('img')[0].style.display = 'none';    
  
  video.load();

  playing=this.id;
 }  

}


function BringBack()
{
 if (document.getElementById("preview-video")!=null )
  {
   document.getElementById("preview-video").remove();
   document.getElementById(playing).getElementsByTagName('img')[0].style.display = 'block';
   playing=0;
  }
}