wap diakritika na chate

potreboval by som pomoct uz neviem ako dalej,na chate sa mi nechce zobrazovat diakritika,v com je asi problem?

<?
Header("Content-Type: text/vnd.wap.wml");
echo '<?xml version="1.0" encoding="iso-8859-2"?>';
if ($zprava!="")
{
if (File_Exists("zpravy.txt"))
{
$zpravy = File("zpravy.txt");
}
$fp = FOpen("zpravy.txt", "w");



FPutS($fp, "<small>$datum</small>/<small>$cas</small>-<strong>$jmeno </strong><br/> $zprava<br/> \n");

for ($i=0; $i<10; $i++)
{
FPutS($fp, $zpravy[$i]);
}
FClose($fp);
}
?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN" "http://www.wapforum.org/DTD/wml_1.1.dtd">

<wml>
<card id="c1" title="chat">
<onevent type="onenterforward">
<refresh>
<setvar name="zprava" value=""/>
</refresh>
</onevent>
<p align="center">
<input name="zprava" type="text" size='15' maxlength="150"/><br/>
<a href="chat.php?jmeno=$(jmeno)&amp;cas=<?echo Date("H:i")?>&amp;datum=<?echo Date("d.m.Y")?>&amp;zprava=$(zprava)&amp;r=<?
echo UniqId("")?>#c1">odoslať/obnoviť</a>
<br/>
</p>
<?
$fp = FOpen("zpravy.txt", "r");
while ($radka = FGetS($fp,512))
{
echo "<p>$radka</p>";
}
FClose($fp);
?>
<p align='center'>
<a href="index.php">odísť</a><br/>
</p>
</card>
</wml>

ani tam neni:( dlzne idu v pohode ale mekcene nie ked napisem ščťž na chate sa ukaze a e~ pismeno č sa ukaze ako prazdno nic