[danik.js]

<style>
img{
    width: 90px;
    -webkit-transition: width 0.5s;
    -moz-transition: width 0.5s;
    -o-transition: width 0.5s;
     transition: width 0.5s;
}
img:hover{
    width: 150px;
}
</style>
<img src="http://img.12pings.net/wallp/optical_illusion_abstract_1280x800.jpg">