/* CSS Document */
body{
background-color:#ffffff;
text-align:center;
margin:0;
}

#main {
width: 500px;
height: 420px;
position: absolute;
top: 50%;
left: 50%;
margin-top: -210px; /* 50% del alto*/
margin-left: -250px; /* 50% del ancho */
}

#contenedor{
text-align:left;
width:500px;
background-color:#ffffff;
margin:auto;
}

#contenidoflash {
background-image:url(images/imagen-bkg.jpg);
width: 500px;
height: 420px;
float: left;
margin: 0px;
}