things will be different depending on how exactly your doing your rollovers, but im assuming your using css
regardless, the concept is the same.
<style type="text/css">
#currentpage {
background-color: yellow;
}
</style>
<?php
if ($_GET['page'] == 'foo') {
echo '<a href="?page=foo" id="currentpage">click to goto foo</a>';
} else {
echo '<a href="?page=foo">click to goto foo</a>';
}
?>
you may want to use a loop to reduce tedious coding if you have a lot of buttons, or write a function that generates the html.
