Problem posting UPDATE information

1

I am having a problem posting information to a database after I update it. I am receiving the error of “undefined index” whenever I activate my form script. I have posted my code below if anyone can see where I am going wrong would be appreciated.

Update Form

<?php
$id=$_GET['id'];
mysql_select_db($dbname, $conn);

$query="SELECT * FROM tbl_links, categories WHERE tbl_links.category_id = categories.category_id AND link_id=$id";
$result= mysql_query($query) or die("error querying database");
$num= mysql_num_rows($result);
mysql_close();

$i=0;
while ($i < $num) 
{$linkID=mysql_result($result,$i,"link_id");
$categoryID=mysql_result($result,$i,"category_id");
$linkTitle=mysql_result($result,$i,"link_title");
$linkDescription=mysql_result($result,$i,"link_desc");
$linkURL=mysql_result($result,$i,"link_url");
$linkDisplay=mysql_result($result,$i,"link_display");

?>
<form action="updatescripts/updatelinks.php">
<input type="hidden" name="inpID" value="<? echo "$linkID"; ?>">
<table cellpadding="5">
<tr>
<th width="120">Field Name</th>
<th width="378">Field Inputs</th>
</tr>
<tr>
<td width="120"><div align="right"><strong>Category :</strong></div></td>
<td>
<select name="inpCat">
  <?php
 
 
mysql_select_db($dbname, $conn);
$query_rsLinks = "SELECT * FROM categories ORDER BY category_name ASC";
$rsLinks = mysql_query($query_rsLinks, $conn) or die(mysql_error());
$row_rsLinks = mysql_fetch_assoc($rsLinks);
$totalRows_rsLinks = mysql_num_rows($rsLinks);
  
do {  
?>
  <option value="<?php echo $row_rsLinks['category_id']?>"><?php echo $row_rsLinks['category_name']?></option>
  <?php
} while ($row_rsLinks = mysql_fetch_assoc($rsLinks));
  $rows = mysql_num_rows($rsLinks);
  if($rows > 0) {
      mysql_data_seek($rsLinks, 0);
	  $row_rsLinks = mysql_fetch_assoc($rsLinks);
  }

include ('../connections/dbclose.php');
?>

</select>
 </td>
</tr>
<tr>
<td width="120"><div align="right"><strong>Title :</strong></div></td>
<td><input type="text" name="inpTitle" value="<? echo $linkTitle ?>" class="inputbox" size="72" /></td>
</tr>
<tr>
<td width="120"><div align="right"><strong>Description :</strong></div></td>
<td><input type="text" name="inpDescription" value="<? echo $linkDescription ?>" class="inputbox" size="72" /></td>
</tr>
<tr>
<td colspan="2">&nbsp;</td>
</tr>
<tr>
<td width="120"><div align="right"><strong>Link URL <em>('http;//' not required)</em> :</strong></div></td>
<td><input type="text" name="inpLinkUrl" value="<? echo $linkURL ?>" class="inputbox" size="72" /></td>
</tr>
<tr>
<td colspan="2">&nbsp;</td>
</tr>
<tr>
<td width="120"><div align="right"><strong>Display Link :</strong></div></td>
<td><input name="inpDisplay" type="checkbox" value="<? echo $linkDisplay ?>" class="inputbox" checked="CHECKED"/></td>
</tr>
<tr>
<td colspan="2">&nbsp;</td>
</tr>
<tr>
<td width="120"><div align="right"><strong>Click to submit :</strong></div></td>
<td><input type="submit" value="Add This Link" name="add" id="add"/></td>
</tr>
</table>
</form>
<?
++$i;
} 
?>

Update Script

<?
include ('../../connections/dbconn.php');

$linkID = $_POST['inpID'];
$linkTitle = $_POST['inpTitle'];
$linkDesc = $_POST['inpDescription'];
$linkUrl = $_POST['inpLinkUrl'];
$linkCategory = $_POST['inpCat'];
$linkDisplay = $_POST['inpDisplay'];


$query = "UPDATE tbl_links SET link_title='$linkTitle', link_desc='$linkDesc', link_url='$linkUrl', category_id='$linkCategory', link_display='$linkDisplay' WHERE link_id='$linkID'";
mysql_select_db($dbname, $conn) or die( "Unable to select database");
mysql_query($query);
echo "<p class='message'>You have successfully edited a link, click here to <a href='edit_link.php'>edit another link</a></p>";
mysql_close();
?>