zoek de fout (str_replace)

<?php
if(isset($_POST['submit'])){
  $content = $_POST['content'];
    $content = str_replace("<a href=\"","<a href=\"?p=",$content);
    $content = str_replace('.htm','',$content);
    echo $content;
}
else{
  ?>
  <form method='post' action=''>
  <input type='text' name='content' size=100>
  <input type='submit' value='enter' name='submit'>
  <?php
}
?>

<?php
if(isset($_POST['submit'])){
  $content = $_POST['content'];
    $content = str_replace("<a href=\"","<a href=\"?p=",$content);
    $content = str_replace('.htm','',$content);
    echo $content;
}
else{
  ?>
  <form method='post' action=''>
  <input type='text' name='content' size=100>
  <input type='submit' value='enter' name='submit'>
  <?php
}
?>