Налаживание пунктов горизонтального суб меню один на другой - Вопросы по CSS

	#divNav {
		background: transparent url(bk-nav.jpg) no-repeat top left;
		margin: 0;
		padding: 0;
		height: 80px;
		width: 800px;
	}

	#nav {
		position: relative;
		top: 3px;
		height: 80px;
		width: 780px;
	}

	#nav li ul, #nav li ul {
		margin: 0;
		padding: 0;
	}

	#nav a {
		text-decoration: none;
		height: 25px;
	}

	#nav li { /*float the main list items*/
		margin: 0;
		float: left;
		display: block;
		padding: 0 5px 0 0;
	}

	#nav li ul {
		display: none;
	}

	#nav li ul li a {
		height: 20px;
	}

	#nav li.off ul, #nav li.on ul  { /*put the subnav below*/
		position: absolute;
		top: 22px;
		left: 0;
		padding-top: 0px;
		background: transparent;
		height: 20px;
		width: 780px;
		padding-left: 5px;
		 
	}

	#nav li.on ul {
		background: transparent;
	}

	#nav li.on ul li.on a {
		color: #0033CC;
	}

	#nav li.on:hover ul, #nav li.over ul { /*for ie*/
		background: transparent;
	}

	#nav li a {
		color: #000000;
		font-weight: bold;
		font-size: 16px;
		line-height: 25px;
		display: block;
		padding: 0;
	}

	#nav li a:hover {
		color: #000000;
		font-weight: bold;
		font-size: 16px;
		line-height: 25px;
		display: block;
		padding: 0;
	}

	#nav li.on a {
		color: #e501a7;
	}


	#nav li.on ul a, #nav li.off ul a {
		border: 0;
		float: left; /*ie doesn't inherit the float*/
		color: #0033CC;
		width: auto;
		margin-right: 0px;
	}

	#nav li.on:hover ul a, #nav li.over ul li a { /*for ie - the specificity is necessary*/
		background: transparent;
	}

	#nav li.on ul {
		display: block;
	}

	#nav li.off:hover ul, #nav li.over ul {
		display: block;
		z-index: 6000;
	}

	#nav li.off a:hover, #nav li.on a:hover { 
		color: #e501a7;
	}

	#nav li.off ul li.off a:hover, #nav li.on ul li.off a:hover { 
		color: #000000;
	}

	/*do the image replacement*/

	#nav li span {
		position: absolute;
		left: -9384px;
	}

	#liRenaissance a, #liArtNouveau a, #liModern a, #liPostModern a, #liDigital a {
		display: block;
		position: relative;
		height: 26px;
		background: url(bk-dropdownMap.gif) no-repeat; /*contains all hover states*/
	}

/*first, put the initial states in place*/

#liRenaissance a {
	background-position: 0 0;
}

#liArtNouveau a {
	background-position: -102px 0;
}

#liModern a {
	background-position: -204px 0;
}

#liPostModern a {
	background-position: -306px 0;
}

#liDigital a {
	background-position: -408px 0;
}

/*active area - for this demo - the code could be based on a body class, and probably work better.*/

 #liModern.on a {
 	background-position: -204px -37px;
 } /*add selectors for the other li's and background-positions*/

/*hover states*/

#liRenaissance a:hover, #liRenaissance:hover a, #liRenaissance.over a {
	background-position: 0 -73px;
}

#liArtNouveau a:hover, #liArtNouveau:hover a, #liArtNouveau.over a {
	background-position: -102px -73px;
}

#liModern a:hover, #liModern:hover a, #liModern.over a {
	background-position: -204px -73px;
}

#liPostModern a:hover, #liPostModern:hover a, #liPostModern.over a {
	background-position: -306px -73px;
}

#liDigital a:hover, #liDigital:hover a, #liDigital.over a {
	background-position: -408px -73px;
}

/*subnav formatting*/

#nav li.off ul a, #nav li.on ul a {
	display: block;
	background: transparent;
	color: #e501a7;
	font-family: arial, verdana, sans-serif;
	font-size: 12px;
	font-weight: normal;
	line-height: 20px;
	padding-top: 10px;
}		

#nav li.on ul a {
	background: transparent;
}