.introBanner h2 { color: #414141; }
#siteIdentification h1 a { display: block; text-indent: -9999px; background: url('http://risanamentoacustico.it/wp-content/uploads/2010/02/SIRA.jpg') top left no-repeat; width: 301px; height: 130px; }
#siteIdentification h1 a:hover { background: url('http://risanamentoacustico.it/wp-content/uploads/2010/02/SIRA.jpg') bottom left no-repeat; }
#explanation { width: 600px; float: right; }