body {background: #FFF url("fondo.gif") repeat-x center;margin:0px;}

#cabecera{width:730px;height:50px;position:absolute;left:50%;top:50%;margin-left:-365px;margin-top:-229px; background: #c0c0c0;}

#menu{width:169px;height:357px;position:absolute;left:50%;top:50%;margin-left:-365px;margin-top:-155px; background: ;}

#contenido{width:561px;height:407px;position:absolute;left:50%;top:50%;margin-left:-196px;margin-top:-207px; background-image: img/avionc.jpg;}

#pie{width:730px;height:24px;position:absolute;left:50%;top:50%;margin-left:-365px;margin-top:205px;}