Making a static but yet a dynamic navigation

[ibnuasad]

I know it sounds confusing but I will try my best to explain what I really mean.

Here is part of my css code:

.navitab {
padding: 4px 8px 4px 8px;
margin: 0 0 4px 0;
text-decoration: none;
letter-spacing: 1px;
background: #e0e0e0 url(images/corner.gif) top right no-repeat;
border-bottom: 1px solid #ffffff;
border-left: 1px solid #ffffff;
}

.activenavitab {
padding: 4px 8px 5px 8px;
color: #ffffff;
margin: 0 0 5px 0;
text-decoration: none;
background: #505050 url(images/corner.gif) top right no-repeat;
}

And my navigation bar at http://ibnuasad.org

<div id="navitabs">
<h2 class="hide">Site menu:</h2>
<a class="activenavitab" href="index.html">Welcome</a><span class="hide"> | </span>
<a class="navitab" href="#">Bio</a><span class="hide"> | </span>
<a class="navitab" href="#">Discography</a><span class="hide"> | </span>
<a class="navitab" href="#">Downloads</a><span class="hide"> | </span>
<a class="navitab" href="#">Photos</a><span class="hide"> | </span>
<a class="navitab" href="#">Tour</a><span class="hide"> | </span>
<a class="navitab" href="#">Merchandise</a><span class="hide"> | </span>
<a class="navitab" href="#">Interviews</a>
</div>

The navigation code is located at index.html. I want to move the code to a separate file called navigation.php and I would place <?php include("navigation.php") ?> in my index.html file.

Here's the problem:
I want to make something like when I go to index.html I want the "Welcome" text to use the activenavitab style. But when I go to downloads.html I want the "Downloads" text to use the style activenavitab and make the "Welcome" text use the "navitab" style.

Note that I will also be using the code <?php include("navigation.php") ?> in the downloads.html file

Anyone knows how to this?

Btw, I was not sure where to post this thread cause it involves CSS, HTML and PHP

EDIT:
Someone had give me the code

<?php
$l[0][0] = "index.html";
$l[0][1] = "Welcome";
 
$l[1][0] = "bio.html";
$l[1][1] = "Bio";
 
$l[2][0] = "contact-page.html";
$l[2][1] = "Contact Me";
 
 
$l[3][0] = "gallery.html";
$l[3][1] = "Gallery";
 
 
$thispage = $_SERVER['SCRIPT_NAME'];
 
$arr = explode("/", $thispage);
$page = strtolower($arr[2]);
?>
<?php
$i = 0;
while ($l[$i] != "") {
if (strtolower(str_replace(" ", "", $l[$i][0])) == $page) {
echo "<a class=\"activenavitab\" href=\"" . $l[$i][0] . "\">" . $l[$i][1] . "</a>"; }
else {
echo "<a class=\"navitab\" href=\"" . $l[$i][0] . "\">" . $l[$i][1] . "</a>"; }
$i++;
}
 
?>

But it still wont show the activenavitab style...I have placed the code into navigation.php and implement it on http://ibnuasad.org/bio.html

Can someone please help me:?: I'm still a php newbie:sad: