<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<ul id="imageCont">
  <li class="normal"></li>
  <li class="normal"></li>
  <li class="normal"></li>
  <li class="normal"></li>
  <li class="normal"></li>
  <li class="normal"></li>
  <li class="normal"></li>
  <li class="normal"></li>
  <li class="normal"></li>
  <li class="normal"></li>
</ul>

body {
  background-color: #248;
}
ul, li{
  margin: 0;
  padding: 0;
  list-style: none;
}
#imageCont{
  width: 500px;
  height: 200px;
  margin: 5% auto;
  position: relative;
  top: 0;
  left: 0;
}
#imageCont > li{
  opacity: 1;
  position: absolute;
  height: 100px;
  width: 100px;
  /*change image here*/
  background-image: url(http://fc09.deviantart.net/fs38/i/2008/328/4/f/Black_and_White_Winter_Scenery_by_rekokros.jpg);
  background-size:500px 200px;
  background-repeat:no-repeat;
  -webkit-transition: all 1s;
  transition: all 1s;
}
#imageCont > li:nth-child(-n+6){
  top: 0;
  background-position-y: 0;
}
#imageCont > li:nth-child(n+6){
  top: 100px;
  background-position-y: -100px;
}
#imageCont > li:nth-child(5n+1){
  left: 0;
  background-position-x: 0;
}
#imageCont > li:nth-child(5n+2){
  left: 100px;
  background-position-x: -100px;
}
#imageCont > li:nth-child(5n+3){
  left: 200px;
  background-position-x: -200px;
}
#imageCont > li:nth-child(5n+4){
  left: 300px;
  background-position-x: -300px;
}
#imageCont > li:nth-child(5n){
  left: 400px;
  background-position-x: -400px;
}
#imageCont > li.normal{
  border-radius: 50%;
  top: 50px;
  left: 200px;
  opacity: .8;
}
/* which tile is at top?*/
#imageCont > li.normal:nth-child(3){ 
  z-index: 5;
  box-shadow: 0px 0px 5px 1px #666;
}
#imageCont > li.normal:nth-child(3):after{ 
  content: '+';
  color: #000;
  font-size: 50px;
  font-weight: bold;
  position: absolute;
  top: 20px;
  left: 0;
  width: 100%;
  text-align: center;
}

$(document).ready(function(){
  var $imageBlocks = $('#imageCont > li');
  
  $imageBlocks.hover(function(){
    $imageBlocks.toggleClass('normal');
  });
});