Bueno ya lo he solucionado, aqui les dejo la modificación:
Cita: #centro_index
{
width:100%;
height:340px;
margin-top:170px;
display:table;
}
#centro_index #top_centro
{
margin:0px;
padding:0px;
border:0px;
height:8px;
background-image:url(../imagenes/top_login.jpg);
background-repeat:no-repeat;
background-position:bottom right;
width:100%;
margin-bottom:0px;
}
#form_centro
{
margin-top:0px;
height:314px;
width:100%;
border:0px;
margin-bottom:0px;
}
#form_centro #imagen_centro
{
margin-top:0px;
margin:0px;
padding:0px;
border:0px;
height:100%;
background-image:url(../imagenes/center_login.jpg);
background-repeat:no-repeat;
background-position:top right;
width:354px;
float:right;
margin-bottom:0px;
}
#centro_index #bottom_centro
{
margin-top:0px;
margin:0px;
padding:0px;
border:0px;
height:8px;
background-image:url(../imagenes/bottom_login.jpg);
background-repeat:no-repeat;
background-position:top right;
width:100%;
}
basicamente con eso se ve igual en opera, mozilla y IE.
