Fatal error: Call to undefined function TituloPage()

Fatal error: Call to undefined function TituloPage() in /home/www/inc_lateral.php on line 5

Será que alguém sabe?

a linha 5 é a seguinte :

<span><?php echo TituloPage($_SESSION['versao'],43);?></span>

código inteiro:

<title></title> <div id="lateral">
 <div id="baixo_logo"><img src="images/baixo_logo.jpg" /></div>
 <div id="busca_lateral">
 <form action="busca.php" method="post">
 <span><?php echo TituloPage($_SESSION['versao'],43);?></span>
 <input name="palavra" type="text" />
 <input name="button" type="submit" class="botao_simples2" id="button" value="OK" />
 </form>
 </div>
 <div id="menu_t"><?php echo TituloPage($_SESSION['versao'],7);?></div>
 <div id="menu">
 <a href="assinar.php"><?php echo TituloPage($_SESSION['versao'],12);?></a>
 <a href="form_login.php"><?php echo TituloPage($_SESSION['versao'],56);?></a>
 <? if (IsLoggedIn()) { ?><a href="login.php?acao=sair"><?php echo TituloPage($_SESSION['versao'],59);?></a><? } ?>
 </div>
 <div id="menu_t"><?php echo TituloPage($_SESSION['versao'],8);?></div>
 <div id="menu">
 <a href="classificados.php"><?php echo TituloPage($_SESSION['versao'],23);?></a>
 <a href="noticias.php"><?php echo TituloPage($_SESSION['versao'],3);?></a>
 <a href="midiacenter.php"><?php echo TituloPage($_SESSION['versao'],41);?></a>
 <a href="galeriadefotos.php"><?php echo TituloPage($_SESSION['versao'],1);?></a>
 <a href="muralderecados.php"><?php echo TituloPage($_SESSION['versao'],5);?></a>
 <a href="chat/index.php" target="_blank"><?php echo TituloPage($_SESSION['versao'],74);?></a>
 <a href="agenda.php"><?php echo TituloPage($_SESSION['versao'],90);?></a>
 <a href="#radio" onClick="popup('player/mediaplayer.html','radio','300','248');"><?php echo TituloPage($_SESSION['versao'],91);?></a>
 </div>
 <div id="menu_t"><?php echo TituloPage($_SESSION['versao'],9);?></div>
<?php
mysql_select_db($database_youlor, $youlor);
$query_menu_pages = "SELECT id, titulo FROM pages WHERE versao = '".$_SESSION['versao']."' AND exibir = 'Sim' ORDER BY titulo ASC";
$menu_pages = mysql_query($query_menu_pages, $youlor) or die(mysql_error());
$row_menu_pages = mysql_fetch_assoc($menu_pages);
$totalRows_menu_pages = mysql_num_rows($menu_pages);
?>
 <div id="menu">
 <? do { ?>
 <a href="page_view.php?id=<? echo $row_menu_pages['id'];?>"><? echo $row_menu_pages['titulo'];?></a>
 <? } while ($row_menu_pages = mysql_fetch_assoc($menu_pages)); ?>
 </div>
<?php
mysql_select_db($database_youlor, $youlor);
$query_banner = "SELECT id, link, imagem FROM banner WHERE versao = '".$_SESSION['versao']."' AND exibir = 'Sim' AND local = 'Lateral' ORDER BY Rand()";
$banner = mysql_query($query_banner, $youlor) or die(mysql_error());
$row_banner = mysql_fetch_assoc($banner);
$totalRows_banner = mysql_num_rows($banner);
?>
 <? if ($totalRows_banner > 0) { ?>
 <div id="banner">
 <? do { ?>
 <?
 $qtd_file_name = strlen($row_banner['imagem']);
 $x = $qtd_file_name - 4;
 $nimagem = substr($row_banner['imagem'],$x,4);
 $nimagem2 = substr($row_banner['imagem'],"0","$x");
 ?>
 <? if ($nimagem <> '.swf') { ?>
 <a href="http://<? echo $row_banner['link'];?>" target="_blank"><img src="images/banner/<? echo $row_banner['imagem'];?>" /></a>
 <? } else { ?><object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,28,0" width="120" height="60">
 <param name="movie" value="images/banner/<? echo $row_banner['imagem']; ?>" />
 <param name="quality" value="high" />
 <embed src="images/banner/<? echo $row_banner['imagem']; ?>" quality="high" pluginspage="http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash" type="application/x-shockwave-flash" width="120" height="60"></embed>
 </object><br /><br /><? } ?>
 <? } while ($row_banner = mysql_fetch_assoc($banner)); ?>
 </div>
 <? } ?>
 </div>