两个检查错误的文句 不错

<?php
 include ("conn.php");
 if($_POST["submit"]){
 $sql="insert into message (id,user,title,content,lastdate)" .
      " values ('','$_POST[user]','$_POST[title]','$_POST[content]',now())";
echo "<script language=\"javascript\">alert('成功');</script>";
print_r($_REQUEST); 
 }
?>

  <form action="add.php" method="post">
  name:<input type="text" size="10" name="user" /><br>
  title:<input type="text" name="title" /><br>
  conntent:<textarea name="content"></textarea><br>
  <input type="submit" name="submit" value="发表留言"/>
  </form>