#submenu {
margin-top: -5px;
margin-left: -5px;
margin-right: -5px;
}
#submenu {
background-image: url('Link Da Imagem')
}

#submenu ul li a:hover {
background-color: transparent;
color: #ffffff;
}

#submenu ul li a {
padding:0.0em 0em 0.0em 0;
color: #ffffff;
text-decoration:none;
}

Blue -> Properties sides, when placed -5 he joins the property of forum # wrapper
Green -> Where iras put the link of the image that remained in the background of your menu
Indigo -> And the color that had been the letters when you hover
Dark blue -> And the color that the letters had been