CSS Dropdownmenu not working in IE6

Hello experts.
I css dropdownmenu that is not working in IE6.
Any help.

html:
 
<style media="all" type="text/css">@import "menu_style.css";</style>
<div class="wrapper1">
	<div class="wrapper"  style="width:1050px;">
		<div class="nav-wrapper">
			<div class="nav-left"></div>
			<div class="nav">
				<ul id="navigation" style="width:988px";>
 
					<li class="#">
						<a href="../index.cfm" target="_self">
							<span class="menu-left"></span>
							<span class="menu-mid">Home</span>
							<span class="menu-right"></span>
						</a>
					</li>
 
					<li class="#">
						<a href="#" target="_self">
							<span class="menu-left"></span>
							<span class="menu-mid">test1</span>
							<span class="menu-right"></span>
						</a>
	            	   	<div class="sub">
   				  <ul>
         			   					<li>
									<a href="#" target="_self">subtest1</a>
								</li>
         			   					<li>
									<a href="#" target="_self">subtest2</a>
								</li>
         			   			
			   				</ul>
					</li>
               </ul>
			</div>
			<div class="nav-right"></div>
		<br><br>
	 </div>
	</div>
</div>
 
menu_style.css
.wrapper1{
	color: #44433f;	
	font: 14px "Futura Medium", "Myriad Pro", "Gill Sans", Helvetica, Verdana, Arial, sans-serif;
	margin: 0;
	padding: 4px 0 0;
	}
	.wrapper1 a{
		color: #E5F2FB;
		text-decoration: none;
	}
	.wrapper1 a:hover {
		color: #09548B;
	}
	.wrapper1 p {
		margin: 0 0 17px;
		padding: 0;
		line-height: 18px;
	}
.wrapper {
	/*width: 710px;*/
	margin: 20px auto;
}
.nav {
	background: #fff url(images/nav_bg.png) repeat-x;
	float: left;
}
.nav-wrapper {
	clear: both;
	float: left;
}
.nav-left {
	background: url(images/nav_left.png) no-repeat top left;
	float: left;
	width: 11px;
	height: 41px;
}
.nav-right {
	background: url(images/nav_right.png) no-repeat top right;
	float: left;
	width: 11px;
	height: 41px;
}
.nav ul {
	/*width: 648px;*/
	height: 38px;
	float: left;
	margin: 0;
	padding-top: 3px;
	list-style: none;
	font-size: 15px;
}
.nav li {
	float: left;
	padding: 0 7px;
	background: url(images/split.png) no-repeat right center;
	position: relative;
	z-index: 1;
}
.nav li.last {
	background:none;
}
.nav li:hover {
	z-index:2;
}
.nav li a {
	display: block;
	line-height: 38px;
	overflow: hidden;
	float: left;
}
a .menu-left {
	background: url(images/menu_left.gif) no-repeat left top;
	width: 8px;
	height: 32px;
	line-height: 35px;
	display: block;
	float: left;
}
a .menu-mid {
	background: url(images/menu_mid.gif) repeat-x top left;
	height: 32px;
	line-height: 35px;
	display: block;
	float: left;
}
a .menu-right {
	background: url(images/menu_right.gif) no-repeat top left;
	width: 8px;
	height: 32px;
	line-height: 35px;
	display: block;
	float: left;
}
.nav li a:hover .menu-left,
.nav li.active a .menu-left,
.nav li:hover a .menu-left,
.nav li a:hover .menu-mid,
.nav li.active a .menu-mid,
.nav li:hover a .menu-mid,
.nav li a:hover .menu-right,
.nav li.active a .menu-right,
.nav li:hover a .menu-right {
	background-position: 0 -37px;
	line-height: 35px;
}
.nav li a:hover,
.nav li.active a,
.nav li.hover a,
.nav li:hover a {
	color: #09548B;
}
.nav li:hover .sub,
.nav li.hover .sub {
	display:block;
}
.nav li .sub {
	display: none;
	position: absolute;
	top: 27px;
	left: 6px;
	background: url(images/submenu_top.png) no-repeat;
	width: 186px;
	padding-top: 9px;
}
.nav li ul {
	background: url(images/submenu_bg.png) repeat-y;
	width: 162px;
	height: auto;
	margin: 0;
	padding: 0 12px 10px;
	list-style: none;
	font-size: 14px;
}
 
.nav li:hover li,
.nav li.active li {
	width: 100%;
	padding: 1px 0 2px;
	border-bottom: 1px #C1D9F0 dashed;
	background: none !important;
}
.nav li:hover li a,
.nav li.active li a {
	color: #09548B;
	background: none !important;
	line-height: normal;
	width: 156px;
	padding: 8px 3px 3px;
	text-indent: 1px;
}
.nav li:hover li a:hover,
.nav li.active li a:hover {
	color: #fff;
	background: #165B9F !important;
	text-decoration: none;
	line-height: normal;
}
/*IE*/
.nav li li a:hover,
.nav li li a:hover {
	color: #fff;
	background: #165B9F !important;
	text-decoration: none;
	line-height: normal;
}
/**/
.nav .btm-bg {
	background: url(images/submenu_bottom.png) no-repeat;
	width: 205px;
	height: 9px;
	overflow: hidden;
	clear: both;
}
.content {
	width: 670px;
	background: transparent url(images/content_bg.png) repeat-y;
	float: left;
	padding: 10px 20px;
}
.content h1 {
	color: #333;
	font-weight: 400;
	text-transform: uppercase;
	font-size: 18px;
	border-bottom: 1px dashed #C1D9F0;
}
.content h2 {
	font-weight: 400;
	text-transform: uppercase;
	font-size: 14px;
	padding-left: 10px;
	margin-bottom: -5px;
}
.content p {
	padding: 0 15px;
	text-align: justify;	
}
.content-bottom {
	width: 710px;
	background: transparent url(images/content_bottom.png) no-repeat;
	height: 13px;
	float: left;
}

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