Unstick threads

case 'sticky':
$id = (int) htmlspecialchars($_GET[id]);
$fetch = mysql_query("SELECT * FROM `forum_thread` WHERE `id` = '$id'");
$thread = mysql_fetch_array($fetch);
if ($thread[sticky] == Yes)
{
echo ("This has already been sticked. <br><a href='javascript: history.go(-1)'>Go back.</a>");
}
else
{
$update = mysql_query("UPDATE `forum_thread` SET `sticky` = 'Yes' WHERE `id` = '$id'");
echo ("Thread has been stickied. <br><a href='javascript: history.go(-1)'>Go back.</a>");
}
break;

case 'notsticky':
$id = (int) htmlspecialchars($_GET[id]);
$fetch = mysql_query("SELECT * FROM `forum_thread` WHERE `id` = '$id'");
$thread = mysql_fetch_array($fetch);
if ($thread[sticky] == No)
{
echo ("This is not a sticky thread <br><a href='javascript: history.go(-1)'>Go back.</a>");
}
else
{
$update = mysql_query("UPDATE `forum_thread` SET `sticky` = 'No' WHERE `id` = '$id'");
echo ("Thread Un-Stuck <br><a href='javascript: history.go(-1)'>Go back.</a>");
}
break;

case 'forumdisplay':

if ($logged[userlevel] == '4' || $logged[userlevel] == '6')
{
echo ("<br><a href='forum_mod.php?page=lock&id=$thread[id]'>Lock</a> - <a href='?page=editthread&id=$thread[id]'>Edit</a> - <a href='forum_mod.php?page=sticky&id=$thread[id]'>Sticky</a>");
}

if ($logged[userlevel] == '4' || $logged[userlevel] == '6')
{
echo ("<br><a href='forum_mod.php?page=lock&id=$thread[id]'>Lock</a> - <a href='?page=editthread&id=$thread[id]'>Edit</a> - <a href='forum_mod.php?page=sticky&id=$thread[id]'>Sticky</a> - <a href='forum_mod.php?page=notsticky&id=$thread[id]'>Unstick</a>");
}