Hi,

How do I change this horiz drop down menu to vertical where it appears to the right

Code:
<script src="jquery-1.9.1.min.js"></script>

<style type="text/css">
body{
font-size:0.85em;
font-family:Verdana, Arial, Helvetica, sans-serif;
}

#nav, #nav ul{
margin:0;
padding:0;
list-style-type:none;
list-style-position:outside;
position:relative;
line-height:1.5em; 
}

#nav a{
display:block;
padding:0px 5px;
border:1px solid #333;
color:#fff;
text-decoration:none;
background-color:#333;
}

#nav a:hover{
background-color:#fff;
color:#333;
}

#nav li{
float:left;
position:relative;
}

#nav ul {
position:absolute;
display:none;
width:12em;
top:1.5em;
}

#nav li ul a{
width:6em;
height:auto;
float:left;
}

#nav ul ul{
top:auto;
}	

#nav li ul ul {
left:12em;
margin:0px 0 0 10px;
}

#nav li:hover ul ul, #nav li:hover ul ul ul, #nav li:hover ul ul ul ul{
display:none;
}
#nav li:hover ul, #nav li li:hover ul, #nav li li li:hover ul, #nav li li li li:hover ul{
display:block;
}
</style>


<script>
function mainmenu(){

$(" #nav li").hover(function(){
		$(this).find('ul:first').css({visibility: "visible",display: "none"}).show(20);
		},function(){
		$(this).find('ul:first').css({visibility: "hidden"});
		});
}

 
 
 $(document).ready(function(){					
	mainmenu();
});
</script>
</head>

<body><ul id="nav">
    <li><a href="#">1 HTML</a></li>
    <li><a href="#">2 CSS</a></li>
    <li><a href="#">3 Javascript </a>
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