sql hledat

<div class=obsah1>
<b>Hladat usera</b><br>
<form method="POST" action"">
Podla userskeho id cisla<input name="user_id"><br><br>
alebo podla mena usera :&nbsp;<input name="user">&nbsp;<br><input value="Hladat" type="submit">
 </form>
 </div>
 
 <div class=obsah1>
<?php
$user_id = $_POST['user_id'];; 
$user = $_POST['user'];;
if(isset($_POST['user_id'])){ 
$vyber=mysql_query("SELECT * FROM `users` WHERE user_id like $user_id");
while($vypis=mysql_fetch_array($vyber)){
     if($vypis['user']){  
     echo "
     <a href=mafia.php?page=user&id=".$vypis['user_id'].">".$vypis['user']."</ a><br>
     ";
}else{
echo "nic sa nenaslo!";
}
}
}
if(isset($_POST['user'])){ 
$vyber=mysql_query("SELECT * FROM `users` WHERE user like %$user%");
while($vypis=mysql_fetch_array($vyber)){
     if($vypis['user']){  
     echo "
     <a href=mafia.php?page=user&id=".$vypis['user_id'].">".$vypis['user']."</ a><br>
     ";
}else{
echo "nic sa nenaslo!";
}
}
}
?>
</div>