一段php 大家帮忙看看哪里错了

<?php
include './top.php';
if(!$_GET['action']=='1'){
echo "<form action='?action=1' method='post'>
分类名称：<input type='text' name='fenlei' /><br />
博文内容：<textarea name='blog' rols='40' rows='30'></textarea><br />
<input type='submit' value='发表' />
</form>";
}else{
$result=mysql_query("SELECT * FROM blog");
$zh=mysql_num_rows($result)-1;
if(!$zh)
$zh=1;
else
$zh=mysql_num_rows($result)-1;
mysql_data_seek($result,$zh);
$id=mysql_fetch_array($result);
$user='博主';
$fenlei=$_POST['fenlei'];
$content=$_POST['blog'];
$date=time();
if(mysql_query("INSERT INTO blog(id,user,fenlei,content,date)
VALUES($id['id'],$user,$fenlei,$content,$date)"))
echo "发表成功！";
else
echo "发表失败！<br />原因：".mysql_error();
mysql_close($con);
}
?>