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<FORM ACTION="forum/login.php" METHOD="POST">
 <INPUT TYPE="HIDDEN" NAME="send" VALUE="send">
 <INPUT TYPE="HIDDEN" NAME="sid" VALUE="$session[hash]">
  <label>Benutzername:</label><input type="text" class="input" name="l_username" SIZE=12 MAXLENGTH=50>
  <br>
  <label>Passwort: </label><input type="password" class="input" name="l_password" SIZE=12 MAXLENGTH=30>
  <br>
  <INPUT class="input" TYPE="SUBMIT" NAME="submit" VALUE="Anmelden">
</form>

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if (isset($session[hash])) {
<form action="forum/login.php?sid=$session[hash]" method="post">
<input type="hidden" value="send" name="send">
<input type="hidden" value="$session[hash]" name="sid">
}
else {
Sie sind eingelogt als bli bla blub ^ ^
}