#menu {
    display: block;
    text-align: left;
    line-height: 30px;
    margin: 0;
    padding: 0;
    list-style: none;
}


#menu li {
    position: relative; /* pour placer en absolu un ul fils d'un li */
    z-index: 5;
    margin: -1px 0 0 -1px;
    text-align: center;
    list-style-type: none;
    color: green;
    border: 1px solid;
    width: 130px;
}


#menu > .onglet {
    float: left;
    cursor: pointer;
}

#menu .item {
    display: none;
}

#menu > .onglet:hover > .item {
    display: block;
    position: absolute;
    margin-top: -1px;
    margin-right: -1px;
    padding-top: 2px;
    padding-bottom: 2px;
    right: 0;
}

#menu > .onglet:hover > .item > li {
    line-height: 30px;
}