สอบถามปัญหาโค้ด Error รันบน XAMPP ไม่เจอตัวแปรค่ะ

<?php
 if($submit=="Edit"){
$sql="select * from user  where u_id ='".$id1."'  ";
$tem = mysql_query($sql);
$row3=mysql_fetch_array($tem);
if($rows)
{
?>


<form action="user.php?submit=OK&show=OK&id1=<? echo $id1?>" method="post"onSubmit="return Check_txt();" enctype='multipart/form-data'>

<input type='hidden' name='u_id' value="<?=$row3['u_id']?>">
<table width="98%">
<tr>
<td width='30%'  align='right'>U_id : </td>
<td width='70%'><input name='u_id' id='u_id' type='text' size='50' value='<?=$row3["u_id"]?>' disabled> * </td>
</tr>
<tr>
<td width='30%'  align='right'>U_name : </td>
<td width='70%'><input name='u_name' id='u_name' type='text' size='50' value='<?=$row3["u_name"]?>'> * </td>
</tr>
<?php
}
?>

<?
if($submit=="Edit"){
$sql="select * from user where u_id ='".$id1."' ";
$tem = mysql_query($sql);
$row3=mysql_fetch_array($tem);

$tem = mysql_query($sql) or die( mysql_error() . "<br>$sql");
if(mysql_num_rows($tem)==0) die ('There is empty record on tem');
$row3=mysql_fetch_assoc($tem);
   ....
   ....