.memu {
	list-style: none outside none;
	margin: 0;
	padding: 0;
}

.memu ul {
	list-style: none outside none;
	margin: 0;
	padding: 0;
	position: absolute;
	left: -9999px;
	margin-left: 20px;
	width: 150px;
	
	-moz-box-shadow: 3px 2px 3px #333;
	-webkit-box-shadow: 3px 2px 3px #333;
	box-shadow: 3px 2px 3px #333;
}
.memu ul ul {
	margin-left: 0px;
	margin-top: 0px;
	
}
.memu a {
	background: #fff;
	background-color: rgba(255, 255, 255, 0.98);
	border: 1px solid #f7f7f7;
	color: #333;
	display: block;
	font: bold 12px/25px segoe ui,verdana,sans-serif;
	margin: 0 -1px -1px 0;
	padding-left: 10px;
	text-decoration: none;
	width: 139px;
	text-overflow: ellipsis;
}

.memu .memu-icon {
	position: relative;
	width: 16px; 
	height: 16px; 
	margin: 4px 10px 0px 0px;
	float: left;
}

.memu li.memu-root > a {
	border-left: 0 !important;
	border-right: 0 !important;
	border-top: 1px solid transparent !important;
	border-bottom: 1px solid transparent !important;
	background: transparent !important;
}

.memu li {
	float: left;
}
.memu li.has-children > a {
	background: url("arrow.png") no-repeat scroll #fff;
	background-position: 130px center;
	background-color: rgba(255, 255, 255, 0.98);
}
.memu li:hover {
	position: relative;
	z-index: 100;
}
.memu li:hover > a {
	background-color: #fff;
	border-color: #fafafa;
	color: #56789A;
}
.memu li:hover > ul {
	left: -20px;
	opacity: 1;
	top: 26px;
	z-index: -1;
}
.memu li:hover li:hover > ul {
	left: 150px;
	opacity: 1;
	top: 0px;
	z-index: 100;
}

.memu-current {
	background-color: #abcdef !important;
	background-color: rgba(235, 245, 255, 0.98 !important);
}
			

Thanks to cssplay.co.uk

$('.js-enabled').memu({ 
	icon: {
		inset: true,		// create an inset where there is no icon
		margin: {		// specify the margins of the icon (put them how it's right for you
			top: 4,
			right: 10
		}
	},
	width: 150,			// the width of the (drop down) items
	rootWidth: 75,			// the width of the (root) items
	height: 25			// the height of the items
});
			

Thanks to jstorage.info

Download it here
Compressed JS only
Css only