a#oinicio { background-image:url(img/port/ivanblanco.jpg); width:510px; height:318px; display:block; }
a#oinicio span { display:none; }
a#oinicio:hover { background-image:url(img/port/ivanlila.jpg); }

#content {
width:1000px;
position:absolute;
margin-left: -500px;
left:50%;
margin-top:-305px;
top:50%;
}
#fondo { 
background-image:url(img/port/fondo.jpg);
width:1000px;
height:610px;
}
#lila {
background-image:url(img/port/ivanlila.jpg);
position:absolute;
width:510px;
height:318px;
top:40px;
left:455px;
}