codice:
<style>
ul{margin:0px;padding:0px;}

li{list-style-type:none;}

.menu{position:relative;}

.menu ul li ul.first_sub{display:none;position:absolute;top:0px;left:100px;}

.menu ul li{border-left:1px solid #000;border-right:1px solid #000;border-bottom:1px solid #000;width:100px;text-align:center;background:#aaaaaa;padding:5px;}

a{display:block;color:#000000;}

.menu ul li:hover ul.first_sub{display:block;}

.menu ul li:hover ul.first_sub li:hover ul.submenu{display:block;position:absolute;top:0px;left:100px;}

ul.submenu{display:none;}
</style>

<div class="menu">
<ul>
<li style="border-top:1px solid #000000;">Home
	
	<ul class="first_sub">
	<li style="border-top:1px solid #000000;">Home3
	[*]Home3
	
		<ul class="submenu">
		<li style="border-top:1px solid #000000;">menu1
		[*]menu2
		[*]menu2
		[/list]
	
	
	[*]Home3
	[/list]

[*]Home1
	
	<ul class="first_sub">
	<li style="border-top:1px solid #000000;">Home4
	[*]Home4
	[*]Home4
	[/list]
	

[*]Home2
	
	<ul class="first_sub">
	<li style="border-top:1px solid #000000;">Home5
	[*]Home5
	[*]Home5
	[/list]
	


[/list]

</div>
Se hai domande chiedi pure