Exemple de rollover javascript

<img class="card" style="top:10px; left:10px; z-index:1;" src="images/pokerAs.png" alt="" 
     onmouseover="this.style.zIndex=6;" onmouseout="this.style.zIndex=1;" />
<img class="card" style="top:74px; left:10px; z-index:2;" src="images/pokerKs.png" alt=""  
     onmouseover="this.style.zIndex=6;" onmouseout="this.style.zIndex=2;" />
...

Illustration