#navigation_vert ul li {display:block; width:200px; height:50px; background:#999; margin:0 0 1px 0; position:relative}

#navigation_vert ul li {display:inline-block; width:200px; height:50px; background:#999; margin:0 0 1px 0; position:relative}

<meta http-equiv="X-UA-Compatible" content="IE=7" />

#navigation_vert ul li {display:block; width:200px; height:50px; background:#999; margin:0 0 1px 0; position:relative}

#navigation_vert ul li {display:inline-block; width:200px; height:50px; background:#999; margin:0 0 1px 0; position:relative}

<script type="text/javascript" src="{ASSETS_JS_PATH}jquery.hoverIntent.minified.js"></script>
<script type="text/javascript" src="{ASSETS_JS_PATH}jquery.naviDropDown.1.0.js"></script>

#navigation_vert {width:820px; clear:both; padding:0 0 0 0; margin:0 auto}
#navigation_vert ul {height:50px; display:block}
#navigation_vert ul li {display:block; width:200px; height:50px; background:#999; margin:0 0 1px 0; position:relative}
#navigation_vert ul li a.navlink {display:block; *display:inline-block; width:200px; height:30px; padding: 20px 0 0 0; text-align:center; color:#fff; text-decoration:none}
#navigation_vert .dropdown {position:absolute; padding:20px; border-bottom-right-radius:10px; border-top-right-radius:10px; -moz-border-radius-bottomright:10px; -moz-border-radius-topright:10px}
#navigation_vert ul li #dropdown_four {background:#333; color:#fff}
#navigation_vert ul li #dropdown_four a {color:red}
#navigation_vert ul li #dropdown_five {background:#666; color:#fff}
#navigation_vert ul li #dropdown_five a {color:black}
#navigation_vert ul li #dropdown_six {background:#777; color:#fff}
#navigation_vert ul li #dropdown_six a {color:orange}

$(function(){
$('#navigation_vert').naviDropDown({
dropDownWidth: '300px',
orientation: 'vertical'
});
});

<div id="navigation_vert">
			 <ul>
				 <li>
					 <a href="" class="navlink">List Item</a>
					 <div class="dropdown" id="dropdown_four">		
						 <p><a href="#">This is a Link</a></p>
						 <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin blandit sodales justo, id fringilla eros dapibus vitae. Morbi molestie enim diam, a vulputate neque. Morbi sit amet nunc id quam mollis aliquet. Donec sed massa justo, ut congue enim. Praesent lobortis viverra dolor commodo euismod. </p>
					 </div><!-- .dropdown_menu -->
				 </li>
				 <li>
					 <a href="" class="navlink">List Item</a>
					 <div class="dropdown" id="dropdown_five">		
						 <p><a href="#">This is a Link</a></p>
						 <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin blandit sodales justo, id fringilla eros dapibus vitae. Morbi molestie enim diam, a vulputate neque. Morbi sit amet nunc id quam mollis aliquet. Donec sed massa justo, ut congue enim. Praesent lobortis viverra dolor commodo euismod. </p>
					 </div><!-- .dropdown_menu -->
				 </li>
				 <li><a href="" class="navlink">List Item</a></li>
				 <li>
					 <a href="" class="navlink">List Item</a>
					 <div class="dropdown" id="dropdown_six">		
						 <p><a href="#">This is a Link</a></p>
						 <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin blandit sodales justo, id fringilla eros dapibus vitae. Morbi molestie enim diam, a vulputate neque. Morbi sit amet nunc id quam mollis aliquet. Donec sed massa justo, ut congue enim. Praesent lobortis viverra dolor commodo euismod. </p>
					 </div><!-- .dropdown_menu -->		
				 </li>
			 </ul>
		 </div>

<a href="" class="navlink">List Item</a>

<div class="dropdown" id="dropdown_four">		
						 <p><a href="#">This is a Link</a></p>
						 <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin blandit sodales justo, id fringilla eros dapibus vitae. Morbi molestie enim diam, a vulputate neque. Morbi sit amet nunc id quam mollis aliquet. Donec sed massa justo, ut congue enim. Praesent lobortis viverra dolor commodo euismod. </p>
					 </div>