.main_menu {
    font-family: "Trebuchet MS", Arial, Verdana;
    font-size: 16px;
    width: 508px;
    margin: 0 0 0 25px;
    float: left;
    height: 40px;
    behavior: url("/js/csshover3.htc");
}

.main_menu ul {
    padding: 0 10px;
    margin: 0;
    background: url('./img/menu.png');
    width:100%;
    height: 100%;
    text-align: center;
    z-index: 1;
}

.main_menu li {
    z-index:1;
    list-style-type: none;
    width: 127px;
    height: 100%;
    margin: 0;
    padding: 0;
    float: left;
    position: relative;
}

.main_menu a {
    color: white;
    display: block;
    line-height: 40px;
    text-decoration: none;
    width: 130px;
    margin: 0;
    padding: 0;
}

.main_menu a:hover  {
    background-color: #666;
    font-weight: bold;
    width: auto;
    height: auto;
}

.main_menu li:hover ul {
    display: block;
}

.main_menu li:hover ul ul {
    display: none;
}

.main_menu ul ul {
    display: none;
    position: absolute;
    left: 0;
    background: none;
    text-align: left;
    width: 100%;
    margin: 0;
    padding: 0;
}

.main_menu ul ul li {
    display: block;
    background: black;
    height: auto;
    width: 150px;
    font-size: 12px;
    line-height: normal;
}

.main_menu ul ul li a {
    float: none;
    padding: 5px 15px;
    margin: 0;
    line-height: normal;
}

.main_menu ul ul li:hover ul {
    left: 150px;
    top: 0;
    position: absolute;
    display: block;
}

.main_menu ul ul li:hover ul ul {
    display: none;
}

.main_menu ul ul ul li:hover ul {
    display: block;
}