<style type='text/css'>
#boton2 {
margin: 0 auto;
margin-bottom: 20px;
padding: 0;
text-align: center;
}
#boton2 a:hover img
{
opacity: 1;
}
#boton2 a img
{
opacity: 0.30;
}
</style>

<div id='boton2'>
<a href='http://unviciomas.com' target="_blank">
<img border='0' src='http://unviciomas.com/_ph/2/2/87402351.jpg' title='www.unViciomas.com'/></a>
</div>