php がフォームを送信できない場合はどうすればよいですか?

html页代码：
<form action="show.php" target="mainFrame" method="post">
<input type="text" name="words" cols="200"/><input type="submit" value="发言"/>
php页代码：
<?php require_once(&#39;config.php&#39;); ?><?phpmysql_select_db("data");$words=$_post[&#39;words&#39;];if($words){$query="insert into chat(chtime,nick,words,face)values(now(),&#39;$nick&#39;,&#39;$words&#39;,&#39;$face&#39;)";//插入SQL语句mysql_query($query,$link_ID); //发送留言到数据库header("refresh:0; URL=&#39;show.php&#39;"); }
?>

<form method="post" action="show.php" enctype="application/x-www-form-urlencoded" name="form1" id="form1">
<input type="text" name="words" value="" />
<input type="submit" value="发言"/>
</form>
<?php
mysql_select_db("data");
$words = $_POST["words"];
if($words){
$query="insert into chat(chtime,nick,words,face)values(now(),&#39;$nick&#39;,&#39;$words&#39;,&#39;$face&#39;)";//插入SQL语句
mysql_query($query,$link_ID); //发送留言到数据库
header("refresh:0; URL=&#39;show.php&#39;"); }
?>