Highligh parent and child navigation menu when active or current

Would someone show me how to highlight parent and child navigation menu when active or current. Thank you.


#menu {
font-weight:700;
list-style:none;
width:990px;
margin:0px auto 0px auto;
height:29px;
padding:0px 0px 0px 0px;

/* Rounded Corners */

-moz-border-radius: 0px;
-webkit-border-radius: 0px;
border-radius: 0px;

/* Background color and gradients */

background: #014464;
background: -moz-linear-gradient(top, #, #);
background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#), to(#));

/* Borders */

border: 1px solid #002232;

-moz-box-shadow:inset 0px 0px 1px #edf9ff;
-webkit-box-shadow:inset 0px 0px 1px #edf9ff;
box-shadow:inset 0px 0px 1px #edf9ff;
}

#menu li {
float:left;
display:block;
text-align:center;
position:relative;
padding: 4px 5px 4px 5px;
margin-right:0px;
margin-top:0px;
border:none;
z-index: 1;
}

#menu li:hover {
border: 1px solid #777777;
padding: 2px 4px 4px 4px;

/* Background color and gradients */

background: #F4F4F4;
background: -moz-linear-gradient(top, #F4F4F4, #EEEEEE);
background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#F4F4F4), to(#EEEEEE));

/* Rounded corners */

-moz-border-radius: 0px 0px 0px 0px;
-webkit-border-radius: 0px 0px 0px 0px;
border-radius: 0px 0px 0px 0px;
}

#menu li a {
font-family:Arial Narrow;
font-size:15px;
color: #EEEEEE;
display:block;
outline:0;
text-decoration:none;
text-shadow: 0px 0px 0px #000;
}

#menu li:hover a {
color:#161616;
text-shadow: 0px 0px 0px #ffffff;
}