body {
margin:0;
padding:0;
}
#marco_maestro{
width:1000px;
margin-top: 10px;
}

#contenido{
width:1000px;
height:713px;
background-image:url("../imagenes/bg_content_internas.jpg");
background-repeat:no-repeat;
}
#contenido_dir{
width:1000px;
height:1023px;
background-image:url("../imagenes/bg_content_internas.jpg");
background-repeat:no-repeat;
}
#barra_izquierda{
width:620px;
margin: 15px 10px 20px 20px;
float:left;
}
#barra_derecha{
width:320px;
margin: 15px 0 20px 10px;
float:left;
}
#pie_de_pagina{
width:1000px;
height:42px;
background-image:url("../imagenes/pie.jpg");
background-repeat:no-repeat;
}

#pie{
 width:1000px;
 height:42px;
 text-align:center;
}