.menu1{
background-image:url(images/menudiv1bg.gif);
margin-left:25px;
padding-left:20px;
padding-top:2px;
padding-bottom: 2px;
display:block;
text-decoration: none;
color: #000000;
height: 20px;
}
.submenu{
background-image: url(images/submenu.gif);
display: block;
height: 19px;
margin-left: 38px;
padding-top: 2px;
padding-left: 7px;
color: #333333;
}

.hide{
display: none;
}

I'll also create the style that will show the hidden div tags (submenus):

.show{
display: block;
}