I have a weird problem and I have been pulling my hair out trying to fix it. Here is the deal. I removed all borders around the navigation except for the bottom. This is simple and works correctly. The only problem is there is a transparent background line about 1 pixel high and I can figure out how to get rid of it. Stylesheet has no such line - I don't think??
Here is a screenshot:

Here is the site:
http://www.pharside.com/web/
Here is the CSSMenu Vert style:
/* Vertical menu for the CMS CSS Menu Module */
/* by Alexander Endresen */
/* The wrapper determines the width of the menu elements */
#menuwrapper {
width: 216px;
}
/* Unless you know what you do, do not touch this */
#primary-nav, #primary-nav ul {
list-style: none;
margin: 0px;
padding: 0px;
width: 100%;
margin-left: 0px;
}
#primary-nav ul {
position: absolute;
top: 0;
left: 100%;
display: none;
}
#primary-nav li {
margin-bottom: 0px;
position: relative;
}
/* Styling the basic apperance of the menu elements */
#primary-nav a {
border-bottom: 1px solid #ffffff;
display: block;
margin: 0px;
padding: 5px 10px;
color: #000000;
font-weight: bold;
text-decoration: none;
background: transparent;
text-align: right;
min-height:1em; /* Fixes IE7 whitespace bug*/
}
#primary-nav li, #primary-nav li.menuparent {
background-color: #f2890e;
min-height:1em; /* Fixes IE7 bug*/
}
/* Styling the basic apperance of the active page elements (shows what page in the menu is being displayed) */
#primary-nav li.menuactive {
background-color: #ffffff;
}
/* Styling the basic apperance of the menuparents - here styled the same on hover (fixes IE bug) */
#primary-nav li.menuparent,
#primary-nav li.menuparent:hover,
#primary-nav li.menuparenth {
background-image: url(images/cms/arrow.gif);
background-position: center right;
background-repeat: no-repeat;
}
/* Styling the apperance of menu items on hover */
#primary-nav li:hover,
#primary-nav li.menuh,
#primary-nav li.menuparenth,
#primary-nav li.menuactiveh {
background-color: #ffffff;
}
/* The magic - set to work for up to a 3 level menu, but can be increased unlimited */
#primary-nav ul,
#primary-nav li:hover ul,
#primary-nav li:hover ul ul,
#primary-nav li.menuparenth ul,
#primary-nav li.menuparenth ul ul {
display: none;
}
#primary-nav li:hover ul,
#primary-nav ul li:hover ul,
#primary-nav ul ul li:hover ul,
#primary-nav li.menuparenth ul,
#primary-nav ul li.menuparenth ul,
#primary-nav ul ul li.menuparenth ul {
display: block;
}
/* IE Hack, will cause the css to not validate */
#primary-nav li, #primary-nav li.menuparenth { _float: left; _height: 1%; }
#primary-nav li a { _height: 1%; }
/* section header */
#primary-nav li.sectionheader {
border-left: 1px solid #006699;
border-top: 1px solid #006699;
font-size: 130%;
font-weight: bold;
padding: 1.5em 0 0.8em 0.5em;
background-color: #fff;
margin: 0;
width: 100%;
}
/* separator */
#primary-nav li hr.separator {
display:block;
height: 0.5em;
color: #abb0b6;
background-color: #abb0b6;
width: 100%;
border:0;
margin:0;
padding:0;
border-top: 1px solid #006699;
border-right: 1px solid #006699;
}