p.menu-header {
    cursor: pointer;
    background: url("../images/foldable-admin-menu.png") no-repeat scroll left -14px transparent;
    padding-left: 16px;
}

p.menu-header.closed {
    background-position: -15px 0;
}
p.menu-header.schrodinger {
    background-position: 0 -41px !important;
}
p.menu-header.closed + .menu-subheaders {
    display: none;
}