ขอโค๊ตการสร้าง list menu แบบ 3 ชั้นหน่อยครับ ช่วยแนะนำหน่อยนะ

/*Menu*/
.menu ul{
	height:35px;
	list-style:none;
	margin:0;
	padding:0;
}
	.menu li{
		float:left;
		padding:0px;
	}
	.menu li a{
		background: url("../images/seperator.gif") bottom right no-repeat;
		color:#FFFFFF;
		display:block;
		font-weight:bold;
		line-height:35px;
		margin:0px;
		padding:0px 25px;
		text-align:center;
		text-decoration:none;
	}
		.menu li a:hover, .menu ul li:hover a{
			background: #667f27 url("../images/hover.gif") bottom center no-repeat;
			color:#FFFFFF;
			text-decoration:none;
		}
	.menu li ul{
		background:#91ab54;
		display:none;
		height:auto;
		padding:0px;
		margin:0px;
		border:0px;
		position:absolute;
		width:225px;
		z-index:200;
		/*top:1em;
		/*left:0;*/
	}
	/*-----------------------------------------*/
	.menu li:hover ul{
		display:block;
	}
	.menu li li {
		background:url('images/sub_sep.gif') bottom left no-repeat;
		display:block;
		float:none;
		margin:0px;
		padding:0px;
		width:225px;
	}
	.menu li:hover li a{
		background:none;
	}
	.menu li ul a{
		display:block;
		height:35px;
		font-size:12px;
		font-style:normal;
		margin:0px;
		padding:0px 10px 0px 15px;
		text-align:left;
	}
		.menu li ul a:hover, .menu li ul li:hover a{
			background:#667f27 url('../images/hover_sub.gif') center left no-repeat;
			border:0px;
			color:#ffffff;
			text-decoration:none;
		}
		
	.menu p{
		clear:left;
	}