#header ul {width: 540px; top: 43px}
#header li {position: static}
#header li a {display: block; float: left; padding: 12px 15px}
body.quem_somos #main_content img {float: left; margin-right: 20px; margin-bottom: 20px}
body.quem_somos #main_content p {clear: both}