li {
	float: left;
}

li ul { 
	/* This is for second-level lists */
	position: absolute;
	top: 20px;
	left: 0px;
}

li>ul { 
	/* I placed this in here to override top and left in browsers other than IE, which will position to the top right of the containing li, rather than bottom left */
	top: auto;
	left: auto;
}

li:hover ul, li.over ul { 
	/* This is for lists nested under hovered list items */
	display: block;
}