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<?if ($_GET["action"] == "einzeln") {  echo "<h2>Zitat</h2>";      while ($dsatz = mysql_fetch_assoc($res)) {      showZitat($dsatz);  }}?>/* TWO */if (isset($_GET["einzeln"])) {  $nummer = $_GET["zitat_nr"];  connectDB();  $res = mysql_query("blah") or die(mysql_error());}<form action="?action=einzeln" method="get"><input name="zitat_nr" type="text"></form>