So it doesn't look pretty, but it should give you what you want and let you implement it accordingly...
Code:
<html>
<head>
<style type="text/css">
* { padding : none; border : none; margin : none; }
.logo { background : blue; }
.menuList { background : pink; }
.clear { clear : both; visibility : hidden; }
.menuList li {list-style : none; width : 150px; float: left; }
.subMenu ul li { list-style : none; width : 100px; background : orange; display : none;}
.subMenu:hover ul li { display : block; }
.content {background : white; color : purple; }
#Wrapper { background : grey; border : 1px ridge black; width : 1024px;}
</style>
</head>
<body>
<div id="Wrapper">
<div class="logo"> Logo image goes here </div>
<div class="menu">
<ul class="menuList">
<li><a href="#"> index </a></li>
<li><a href="#"> about </a></li>
<li class="subMenu"><a href="#"> boxwood </a>
<hr class="clear" />
<ul>
<li><a href="#">one</a></li>
<li><a href="#"> two </a></li>
<li><a href="#"> three </a></li>
</ul>
</li>
<li><a href="#"> contact </a></li>
</ul>
</div>
<hr class="clear" />
<div class="content"> example content </div>
</div>
</body>
</html>
*and definitely does validate as it stands now lol :P