Why does two level Drop Down Menu not working in IE and works fine with all browsers?

[Ash Mar]

Hi Every one :)

My Issue is the sub menu level 2 Not working in Internet Explore but it's working perfect in all other browsers.
I Spend more than 6 hours and could not find the solution guys if could help that would be grate :)

You can View the menu in this URL:http://www.1.ashraf.ly

If you test this in IE The digital sub menu will not open my level 2 sub "Laptop"
You can Download the files from the attached file.
You can View my Html Code here:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title></title>
<link rel="stylesheet" href="menu_style.css" type="text/css" />
</head>

<body>

      <div class="menu"> 
    
     <ul> 
			<li><a href="#" >Home</a></li>
            
             <li><a href="#" id="current">Products</a>
             
	 <ul>
                
			 <li class="sub"><a href="#">Digital <img border="0" align="absmiddle" style="float:right; margin-top:11px;"src="images/comnav-arrowover.png"></a>
             
     <ul class="sub">
                    <li><a href="#">Laptop</a></li>
     
                    </ul>
                    </li>

		</ul>
        </div>
</body>
</html>

You can View my CSS Code here

.menu{
	border:none;
	border:0px;
	margin:0px;
	padding:0px;
	font-family:verdana,geneva,arial,helvetica,sans-serif;
	font-size:14px;
	font-weight:bold;
	color:8e8e8e;
	}
.menu ul{
	background:url(images/menu-bg.gif) top left repeat-x;
	height:43px;
	list-style:none;
	margin:0;
	padding:0;
	}
	.menu li{
		float:left;
		}
	.menu li a{
		color:#666666;
		display:block;
		font-weight:bold;
		line-height:43px;
		padding:0px 25px;
		text-align:center;
		text-decoration:none;
		}
		.menu li a:hover{
			color:#000000;
			text-decoration:none;
			}
	.menu li ul{
		background:#e0e0e0;
		border-left:2px solid #0079b2;
		border-right:2px solid #0079b2;
		border-bottom:2px solid #0079b2;
		display:none;
		height:auto;
		filter:alpha(opacity=95);
		opacity:0.95;
		position:absolute;
		width:225px;
		z-index:200;
		/*top:1em;
		/*left:0;*/
		}
	.menu li:hover ul{
		display:block;
		}
	.menu li li {
		display:block;
		float:none;
		width:225px;
		}
	.menu li ul a{
		display:block;
		font-size:12px;
		font-style:normal;
		padding:0px 10px 0px 15px;
		text-align:left;
		}
		.menu li ul a:hover{
			background:#949494;
			color:#000000;
			opacity:1.0;
			filter:alpha(opacity=100);
			}
	.menu p{
		clear:left;
		}	
	.menu #current{
		background:url(images/current-bg.gif) top left repeat-x;
		color:#ffffff;
		}
		
<!------SUB----------!>

		 li a:hover{
			color:#0F0;
			text-decoration:none;
			}
			
	li.sub ul.sub{
		background:#e0e0e0;
		border-left:2px solid #0079b2;
		border-right:2px solid #0079b2;
		border-bottom:2px solid #0079b2;
		display:none;
		top:0px;
		left:100%;
		height:auto;
		filter:alpha(opacity=95);
		opacity:0.95;
		position:absolute;
		width:225px;
	
		}
		
		
	li.sub:hover ul.sub{
		display:block;
		left: 100%;
        top: 0;
		}

Thank you,
ASH