HTML

<div id="containerEx7">
<div class="ex7"><img src="http://gif" alt="" width="190" height="170" /> <img src="http://gif" alt="" width="190" height="170" /></div>
</div>

CSS

<style type="text/css"><!--
#containerEx7 {width: 800px;
margin: 0 auto;
}
.ex7 img {
margin: 20px;
border: 2px dotted #fff; 
border-radius: 1em;
-webkit-box-shadow: 4px 4px 4px rgba(0,0,0,0.2);
-moz-box-shadow: 4px 4px 4px rgba(0,0,0,0.2);
box-shadow: 4px 4px 4px rgba(0,0,0,0.2);
-webkit-transition: all 0.5s ease-out;
-moz-transition: all 0.5s ease;
-ms-transition: all 0.5s ease;
}
.ex7 img:hover {
-webkit-transform: translateY(-100px); }
-webkit-transform: translateY(30px); }
-webkit-transform: translateY(-10px); }
 -webkit-transform: translateY(0); }
}
 -moz-transform: translateY(-100px); }
-moz-transform: translateY(30px); }
 -moz-transform: translateY(-10px); }
opacity: 1; -moz-transform: translateY(0); }
}
 opacity: 0; -o-transform: translateY(-100px); }
-o-transform: translateY(30px); }
-o-transform: translateY(-10px); }
opacity: 1; -o-transform: translateY(0); }
}
opacity: 0; transform: translateY(-100px); }
transform: translateY(30px); }
transform: translateY(-10px); }
opacity: 1; transform: translateY(0); }
}
--></style>