This is the CSS used for the Sidemenu on the left of www.inventua.com (this site).

/* SideMenu  */
.MenuHdr
{ 
  font-size: 10pt; padding-left: 10px; font-weight: bold; padding-bottom: 2px; 
  background-color: #f1f1f1; padding-top: 2px; cursor: default;
}
.MenuItem HR
{
  background-color: #f1f1f1; 
  border-top: none;
  border-left: none;
  border-right: none;
  border-bottom: 1px solid #999999;   
  margin-right: 5px; 
}

.MenuItemMouseOver
{
  background-position: right top;
  background-image: url(images/menuarrow-bg.gif);
  background-repeat: no-repeat;
  border: #00008B 1px solid;
  background-color: #cccccc !important;  
}

.MenuItem, .MenuItemMouseOver
{
  font-size: 8pt; font-weight: normal; padding-bottom: 1px;
  background-color: #f1f1f1; padding-top: 1px;
  border: #f1f1f1 1px solid; 
}
.MenuHdr A, .MenuHdr A:Active, .MenuHdr A:Hover, .MenuHdr A:Visited, .MenuHdr A:Link
{
  text-decoration: none; color: black; padding-top: 1px;
  padding-bottom: 1px; cursor: pointer; display: block; 
}
.MenuItem A, .MenuItem A:Active, .MenuItem A:Hover, .MenuItem A:Visited, .MenuItem A:Link, 
.MenuItemMouseOver A, .MenuItemMouseOver A:Active, .MenuItemMouseOver A:Hover, 
.MenuItemMouseOver A:Visited, .MenuItemMouseOver A:Link
{
  display: block;
  padding-left: 20px;
  padding-bottom: 1px;
  cursor: pointer;
  color: black;
  padding-top: 1px;
  text-decoration: none;   
  width: 100% 
}

.MenuCurrentPage
{
  color: #696969;
}

This is the CSS used in the left-hand menu on www.dnnupdate.com.  Note the special #invsidemenu tags to control the display of the "Downloads" link.

#invsidemenu-Downloads A
{
  border: red 1px dotted;
  color: red!important;
  font-weight: bold;
}

#invsidemenu-Downloads A:hover, #invsidemenu-Downloads A:active
{
  border: #1A76D3 1px solid;
  color: white!important;
  font-weight: bold;
}

.MenuHdr
{
  padding-left: 10px;
  font-weight: bold;
  font-size: 9pt;
  padding-bottom: 2px;
  cursor: default;
  padding-top: 2px;
  font-family: Tahoma, Arial;
}
.MenuItem HR
{
  border-top: none;
  border-left: none;
  border-right: none;
  border-bottom: 1px solid #999999;    
}

.MenuItem, .MenuItemMouseOver
{
  font-family: Tahoma, Arial; font-size: 9pt; font-weight: normal; padding-bottom: 1px;
  padding-top: 1px;
  border: white 1px solid;    
}
.MenuHdr A, .MenuHdr A:Active, .MenuHdr A:Hover, .MenuHdr A:Visited, .MenuHdr A:Link
{
  display: block;
  padding-bottom: 1px;
  width: 100%;
  cursor: pointer;
  color: black;
  padding-top: 1px;
  text-decoration: none;
}

.MenuItem A, .MenuItem A:Active, .MenuItem A:Hover, .MenuItem A:Visited, .MenuItem A:Link
{
  display: block;
  padding-left: 20px;
  padding-bottom: 1px;
  width: 100%;
  cursor: pointer;
  color: black;
  padding-top: 1px;
  text-decoration: none;
}
  
.MenuItemMouseOver
{
  border: #00008B 1px solid;
  background-color: #1A76D3!important;
  padding-left: 20px; 
}

.MenuItemMouseOver A, .MenuItemMouseOver A:Active, 
.MenuItemMouseOver A:Hover, .MenuItemMouseOver A:Visited, .MenuItemMouseOver A:Link
{
  color: white;
  text-decoration: none; 
  width: 100%; 
  padding-top: 1px; 
  padding-bottom: 1px; 
  cursor: pointer; display: block; 
}