/* Principal */
#menu,#menuD, #menu ul {
    margin: 0;
    padding: 0;
    list-style: none;
}
#menu{
        width: 100%;
        margin: 0;
        padding: 10px 0 0 0;
        list-style: none;
        background: #111;
        background: -moz-linear-gradient(#ff00ff, #b100b1);
        background: -webkit-gradient(linear,left bottom,left top,color-stop(0, #b100b1),color-stop(1, #ff00ff));
        background: -webkit-linear-gradient(#ff00ff, #b100b1);
        background: -o-linear-gradient(#ff00ff, #b100b1);
        background: -ms-linear-gradient(#ff00ff, #b100b1);
        background: linear-gradient(#ff00ff, #b100b1);
        -moz-border-radius: 0px;
        border-radius: 0px;
        -moz-box-shadow: 0 2px 1px #9c9c9c;
        -webkit-box-shadow: 0 2px 1px #9c9c9c;
        box-shadow: 0 2px 1px #9c9c9c;
}

#menu li{
        float: left;
        padding: 0 0 6px 0;
        position: relative;
}

#menu a{
        float: left;
        height: 30px;
        padding: 0 18px;
        color: #fff;
        text-transform: uppercase;
        font: bold 12px/25px Arial, Helvetica;
        text-decoration: none;
        text-shadow: 0 1px 0 #000;
}

#menu .menu_right {
	float:right;
	margin-right:8px;
}

#menu .menu_right a  {
        float: right;
        height: 30px;
        padding: 0 0px;
        color: #fff;
        text-transform: uppercase;
        font: bold 12px/25px Arial, Helvetica;
        text-decoration: none;
        text-shadow: 0 1px 0 #000;
}


#menu li:hover > a{
        color: #e2e2e2;
}

*html #menu li a:hover{ /* IE6 */
        color: #fafafa;
}

#menu li:hover > ul{
        display: block;
}
#menu ul ul {
    top: 0;
    left: 180px;
    margin: 0 0 0 20px;
    _margin: 0; /*IE6 only*/
    box-shadow: -1px 0 0 rgba(255,255,255,.3);      
}

/* Sous-menu */

#menu ul{
    width: 200px;
	list-style: none;
    margin: 0;
    padding: 0;
    display: none;
    position: absolute;
    top: 35px;
    left: 0;
    z-index: 99999;
    background: #fff;
    background: -moz-linear-gradient(#7e7e7e, #7e7e7e);
    background: -webkit-gradient(linear,left bottom,left top,color-stop(0, #7e7e7e),color-stop(1, #7e7e7e));
    background: -webkit-linear-gradient(#7e7e7e, #7e7e7e);
    background: -o-linear-gradient(#7e7e7e, #7e7e7e);
    background: -ms-linear-gradient(#7e7e7e, #7e7e7e);
    background: linear-gradient(#7e7e7e, #7e7e7e);
    -moz-border-radius: 5px;
    border-radius: 5px;
}

#menu ul a{
        float: left;
        height: 30px;
        padding: 0 18px;
        color: #fff
        text-transform: uppercase;
        font: bold 12px/25px Arial, Helvetica;
        text-decoration: none;
        text-shadow: 0 1px 0 #000;
}

#menu ul li{
    float: none;
    margin: 0;
    padding: 0;
    display: block;
    -moz-box-shadow: 0 1px 0 #fff, 0 2px 0 #777777;
    -webkit-box-shadow: 0 1px 0 #fff, 0 2px 0 #777777;
    box-shadow: 0 1px 0 #fff, 0 2px 0 #777777;
}

#menu ul li:last-child{
    -moz-box-shadow: none;
    -webkit-box-shadow: none;
    box-shadow: none;
}

#menu ul a{
    float: none;
	padding: 10px;
    height: auto;
    line-height: 1;
    display: block;
    white-space: nowrap;
    float: none;
    text-transform: none;
}

*html #menu ul a{ /* IE6 */
        height: 10px;
        width: 150px;
}

*:first-child+html #menu ul a{ /* IE7 */
        height: 10px;
        width: 150px;
}

#menu ul a:hover{
        background: #b100b1;
        background: -moz-linear-gradient(#ff00ff,  #b100b1);
        background: -webkit-gradient(linear, left top, left bottom, from(#ff00ff), to(#b100b1));
        background: -webkit-linear-gradient(#ff00ff,  #b100b1);
        background: -o-linear-gradient(#ff00ff,  #b100b1);
        background: -ms-linear-gradient(#ff00ff,  #b100b1);
        background: linear-gradient(#ff00ff,  #b100b1);
}

#menu ul li:first-child a{
    -moz-border-radius: 5px 5px 0 0;
    -webkit-border-radius: 5px 5px 0 0;
    border-radius: 5px 5px 0 0;
}

#menu ul li:first-child a:after{
    content: '';
    position: absolute;
    left: 30px;
    top: -8px;
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-bottom: 8px solid #444;
}
#menu ul ul li:first-child a:after {
    left: -6px;
    top: 50%;
    margin-top: -6px;
    border-left: 0; 
    border-bottom: 6px solid transparent;
    border-top: 6px solid transparent;
    border-right: 6px solid #3b3b3b;
}

#menu ul li:first-child a:hover:after{
    border-bottom-color: #ff00ff;
}

#menu ul li:last-child a{
    -moz-border-radius: 0 0 5px 5px;
    -webkit-border-radius: 0 0 5px 5px;
    border-radius: 0 0 5px 5px;
}

/* Rétablissement du flottement */
#menu:after{
        visibility: hidden;
        display: block;
        font-size: 0;
        content: " ";
        clear: both;
        height: 0;
}

* html #menu             { zoom: 1; } /* IE6 */
*:first-child+html #menu { zoom: 1; } /* IE7 */
<script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>
<script type="text/javascript">
        $(function() {
          if ($.browser.msie && $.browser.version.substr(0,1)<7)
          {
                $('li').has('ul').mouseover(function(){
                        $(this).children('ul').show();
                        }).mouseout(function(){
                        $(this).children('ul').hide();
                        })
          }
        });
</script>
* html #menu             { zoom: 1; } /* IE6 */
*:first-child+html #menu { zoom: 1; } /* IE7 */