1) echo "<a href='./$cfggame__".preg_replace('#[^a-zA-Z0-9_\-]+#')."'></a>";
2) unuttum
3) <form id="form1" name="form1" method="post" action="<?=$siteadresi?>/gamesearch.php">

<input name="param1" type="text" style="width:300px; height:17px;" value="Aranacak Oyun Adınız Yazın..." onClick="this.value=''" size="14">
<input type="hidden" name="modul" value="<?=$cfgtag?>" />
<input type="hidden" name="param2" value="1" />
<input type="submit" value="Gönder" />
</form>