请大侠们帮小弟我看看这个有关问题出在哪

请大侠们帮我看看这个问题出在哪？
代码如下

<br>
nbsp;html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br>
<br>
<br>
<br>
<br>
<?php  <br />
    require_once 'header.php'; <br>
    require_once 'check.php';<br>
?><br>
<br>
<meta><br>
<meta><br>
<title>Item Detail</title><br>
<style><br />
.auto-style2 {<br />
    text-align: center;<br />
}<br />
.auto-style1 {<br />
    font-size: 36pt;<br />
    text-align: left;<br />
    font-family: Default;<br />
}<br />
.auto-style3 {<br />
    font-family: Broadway;<br />
}<br />
</style><br>
<br>
<br>
<br>
<?php <br />
    if(isset($_POST['submit_edit_item_id']))<br>
    {<br>
        $_SESSION['eidt_item_id'] = $_POST['sub_edit_item_id'];<br>
    }<br>
    <br>
    $item_id = $_SESSION['eidt_item_id'];<br>
        <br>
    $result = mysql_query("SELECT * FROM ITEM WHERE ITEM_ID = $item_id");<br>
    <br>
    if($result)<br>
    {<br>
        $row = mysql_fetch_array($result);<br>
        <br>
        $user_id = $_SESSION['id'];<br>
        $name = $row['NAME'];<br>
        $dsc = $row['DESCRIPTION'];<br>
        $auc = $row['RESERVE_PRICE'];<br>
        $bin = $row['BIN_PRICE'];<br>
        $btime = $row['BEGIN'];<br>
        $etime = $row['END'];<br>
        $status = $row['STATUS'];<br>
        $seller = $row['SELLER_ID'];<br>
        $winner = $row['WINNER_ID'];<br>
        $curr_bid = $row['CURR_BID'];<br>
        $num_bid = $row['NUM_BID'];<br>
        $img_id = $row['IMG_ID'];<br>
    }<br>
    <br>
    $result = mysql_query("SELECT USER_NAME FROM USER WHERE USER_ID = $seller");<br>
    if($result)<br>
    {<br>
        $row = mysql_fetch_array($result);<br>
        $seller_name = $row['USER_NAME'];<br>
    }<br>
?><br>
<br>

Edit item:

---

display_image($img_id, 500, 400);
?>

if(isset($_POST['sub_change_pic']))
{
if(isset($_FILES['image']))
{
$file = $_FILES['image']['tmp_name'];
if(!empty($file))
{
$image = addslashes(file_get_contents($file));