html-con css imagen de fondo que no se ve

[flopyta]

copio el codigo del css x sino se ve
body {
background-image: url(fondo.gif);
margin-left: 150px;
margin-top: 0px;
}
.top {
text-decoration: none;
background-image: url(top.jpg);
background-repeat: no-repeat;
display: none;
}
.top table {
color: #FFF;
font-family: Arial, Helvetica, sans-serif;
font-weight: bold;
font-variant: normal;
text-transform: none;
text-decoration: none;
font-size: 14px;
}