How to change category link display in pages

Hi there,
I made a menu composed with wp_category_list that lists category links I want, I use some css for rollover effect, etc.
Now, I want to change category link display in pages “I am in” (for ex. background of portfolio link in white rather than black when I am in portfolio page).
For this I defined the #current and #notcurrent in my css stylesheet but problem is that the following code works like this :

<div id="navmenu" align="right">
		<ul>
		<li<?php if ( in_category(3) )
				{
				echo " id=\"current\"";
				}
				 else
				{
				echo " id=\"notcurrent\"";
				}
				 ?>><a href="https://localhost/wordpress/?cat=3" target="_self">folio</a></li>

but not with wp_list_category:

<div id="navmenu" align="right">
		<ul>
		<li<?php if ( in_category(5) )
				{
				echo " id=\"current5\"";
				}
				 else
				{
				echo " id=\"notcurrent5\"";
				}
				?>><?php wp_list_categories('include=5&title_li='); ?></li>

Here is the css:

#navmenu ul {
	margin: 0; padding: 0;
	list-style-type: none;
	list-style-image: none;
	}

#navmenu li {
	display: inline;
	}

#navmenu ul li a {
	font-size:7pt;
	text-decoration: none;
	margin: 8px;
	padding: 2px 5px 2px 5px; 

	}

#navmenu ul li a:hover {
	font-size: 7pt;
	text-decoration:none;
	color: #ffffff;
	background-color:#ff00a4;
	}

#navmenu {
	position: relative;
	right: 30px;
	padding:80px 0 0 198px;
	}	

#current a {
	color:#ffffff;
	background-color: #ff00a4;
	}

#notcurrent a {
	color:#000000;
	}

Hope someone will be able to give me an hand on this, thanks.

[title moderated MH]