Problem s aktivnym menu

<?php
echo "<div id='menu-hlavne'>";
echo "<div class='sub'><br><br>";
echo "<ul>";
echo "<li";
if ($go=='uvod') {
   echo " class='vybrane'";
}
echo "><img src='images/li.gif'> <a href='index.php?go=uvod'>Home</a></li>\n";
echo "<li";
if ($go=='oddelenia') {
   echo " class='vybrane'";
}
echo "><img src='images/li.gif'> <a href='index.php?sub=2&go=oddelenia'>Oddelenia</a></li>\n";
echo "<li";
if ($go=='archiv') {
   echo " class='vybrane'";
}
echo "><img src='images/li.gif'> <a href='index.php?sub=3&go=archiv'>Archív</a></li>\n";
echo "<li";
if ($go=='foto') {
   echo " class='vybrane'";
}
echo "><img src='images/li.gif'> <a href='index.php?sub=4&go=foto'>Fotoalbum</a></li>\n";
echo "<li";
if ($go=='kontakty') {
   echo " class='vybrane'";
}
echo "><img src='images/li.gif'> <a href='index.php?sub=kontakty&go=kontakty'>Kontakty</a></li>\n";
echo "</ul>";
echo "</div>";
echo "</div>";
?>