รบกวนด้วยครับ ผมต้องการ active page when search or edit

<h1>Stationary Stock System</h1>
<ol id="toc">
    <li><a href="#showitem"><span>Show Item</span></a></li>
	<li><a href="#alert"><span>Minimum</span></a></li>
	<li><a href="#invoice"><span>Invoice</span></a></li>
	<li><a href="#search"><span>Search</span></a></li>
	<li><a href="#bring"><span>Bring</span></a></li>
	<li><a href="#addpro"><span>Add Product</span></a></li>
    <li><a href="#update"><span>Recieve</span></a></li>
	<li><a href="#report"><span>Report</span></a></li>
	<li><a href="#export"><span>Export</span></a></li>
	<li><a href="index.php"><span>Logout</span></a></li>
	<div align = "right">
	<?php
		$a=$_SESSION['SESS_MEMBER_ID'];
		$sql= mysql_query("select fname from user where id = '$a'");
		while($row = mysql_fetch_array($sql)){
				echo '<h4> Welcome '.$row['fname'].'</h4>';
		}
	?>
	</div>	
</ol>

<div class="content" id="showitem">

<?php
include("db.php");
if($_POST["hdnCmd"] == "Update")
{
	$strSQL = "UPDATE inventory SET item = '".$_POST["txtedititem"]."', supplier = '".$_POST["txteditsup"]."', qtyleft = '".$_POST["txteditqty"]."', unit = '".$_POST["txteditunit"]."'";
	$strSQL .="WHERE id = '".$_POST["hdnEditID"]."' ";
	$objQuery = mysql_query($strSQL);
}
?>

<form name="frmMain" method="post" action="<?php echo $_SERVER["PHP_SELF"];?>">
<input type="hidden" name="hdnCmd" value="">

<br><br>
<table width="100%">
	<tr class="head">
		<th>No</th>
		<th>Item</th>
		<th>Quantity</th>
		<th>Unit</th>
		<th>Supplier</th>
		<th>Edit</th>
	<?php
		if($a == 3){ ?>			
			<th>Delete</th>
		<?php } ?>
	</tr>	
<?php
	$sql=mysql_query("select * from inventory order by item");
	$i=1;

	while($row=mysql_fetch_array($sql))
	{
		$id=$row['id'];
		$item=$row['item'];
		$qty=$row['qtyleft'];
		$unit=$row['unit'];
		$sup=$row['supplier'];

		if($row["id"] == $_GET["ID"] and $_GET["Action"] == "Edit")
		{ ?>

			<tr>
				<td><div align="center">
					<?php echo $i;?>
					<input type="hidden" name="hdnEditID" size="5" value="<?php echo $id;?>">
					</div>
				</td>
				<td>
					<input type="text" name="txtedititem" size="100" value="<?php echo $item;?>">
				</td>
				<td>
					<input type="text" name="txteditqty" size="5" value="<?php echo $qty;?>">
				</td>
				<td>
					<input type="text" name="txteditunit" size="5" value="<?php echo $unit;?>">
				</td> 
				<td>
					<input type="text" name="txteditsup" size="50" value="<?php echo $sup;?>">
				</td>    
    
				<td colspan="2" align="right"><div align="center">
					<input name="btnAdd" type="button" id="btnUpdate" value="Update" OnClick="frmMain.hdnCmd.value='Update';frmMain.submit();">
					<input name="btnAdd" type="button" id="btnCancel" value="Cancel" OnClick="window.location='<?php echo $_SERVER["PHP_SELF"];?>';">
					</div>
				</td>
			</tr>
<?php }

		if($i%2) { ?>
			<tr id="<?php echo $id; ?>" class="edit_tr">
	<?php } else { ?>
			<tr id="<?php echo $id; ?>" bgcolor="#f2f2f2" class="edit_tr">
	<?php } ?>
				<td>
					<span class="text"><?php echo $i; ?></span>
				</td>
				<td>
					<span class="text"><?php echo $item; ?></span>
				</td>
				<td>
					<span class="text"><?php echo $qty; ?></span>
				</td>
				<td>
					<span class="text"><?php echo $unit; ?></span>
				</td>
				<td>
					<span class="text"><?php echo $sup; ?></span>
				</td>
				<td>
					<span class="text"><a href="<?php echo $_SERVER["PHP_SELF"];?>?Action=Edit&ID=<?php echo $row["id"];?>"><img src="/inventory/images/edit.png" /></a></span>	
				</td>
		<?php
				if ($a == 3) { ?>		
				<td>
					<span class="text"><a href="delete.php?id=<?php echo $row["id"];?>"><img src="/inventory/images/del.png" /></a></span>
				</td>
			<?php } ?>
			</tr>
<?php
	$i++;
	}
?>
</table>
<br />
</div>

<div class="content" id="invoice">

<?php
include("db.php");
if($_POST["hdnCmd"] == "Update")
{
	$strSQL = "UPDATE receive SET inv = '".$_POST["txteditinv"]."'";
	$strSQL .="WHERE id = '".$_POST["hdnEditID"]."' ";
	$objQuery = mysql_query($strSQL);
}
?>

<form name="frmMain" method="post" action="<?php echo $_SERVER["PHP_SELF"];?>">
<input type="hidden" name="hdnCmd" value="">

<br><br>
<table width="100%">
	<tr class="head">
		<th>No</th>
		<th>Item</th>
		<th>Quantity</th>
		<th>Invoice</th>
		<th>Receive Date</th>
		<th>Edit</th>
	<?php
		if($a == 3){ ?>			
			<th>Delete</th>
		<?php } ?>
	</tr>	
<?php
	$sql=mysql_query("select receive.id, inventory.item, receive.qty, receive.inv, receive.r_date from inventory,receive where receive.item = inventory.id order by receive.r_date desc, receive.inv , inventory.item");
	$i=1;

	while($row=mysql_fetch_array($sql))
	{
		$id=$row['id'];
		$item=$row['item'];
		$qty=$row['qty'];
		$inv=$row['inv'];
		$rdate=$row['r_date'];

		if($row["id"] == $_GET["ID"] and $_GET["Action"] == "Edit")
		{ ?>

			<tr>
				<td><div align="center">
					<?php echo $i;?>
					<input type="hidden" name="hdnEditID" size="5" value="<?php echo $id;?>">
					</div>
				</td>
				<td>
					<?php echo $item;?>
				</td>
				<td>
					<?php echo $qty;?>
				</td>
				<td>
					<input type="text" name="txteditinv" size="5" value="<?php echo $inv;?>">
				</td>
				<td>
					<?php echo $rdate;?>
				</td>
    
				<td colspan="2" align="right"><div align="center">
					<input name="btnAdd" type="button" id="btnUpdate" value="Update" OnClick="frmMain.hdnCmd.value='Update';frmMain.submit();">
					<input name="btnAdd" type="button" id="btnCancel" value="Cancel" OnClick="window.location='<?php echo $_SERVER["PHP_SELF"];?>';">
					</div>
				</td>
			</tr>
<?php }

		if($i%2) { ?>
			<tr id="<?php echo $id; ?>" class="edit_tr">
	<?php } else { ?>
			<tr id="<?php echo $id; ?>" bgcolor="#f2f2f2" class="edit_tr">
	<?php } ?>
				<td>
					<span class="text"><?php echo $i; ?></span>
				</td>
				<td>
					<span class="text"><?php echo $item; ?></span>
				</td>
				<td>
					<span class="text"><?php echo $qty; ?></span>
				</td>
				<td>
					<span class="text"><?php echo $inv; ?></span>
				</td>
				<td>
					<span class="text"><?php echo $rdate; ?></span>
				</td>
				<td>
					<span class="text"><a href="<?php echo $_SERVER["PHP_SELF"];?>?Action=Edit&ID=<?php echo $row["id"];?>"><img src="/inventory/images/edit.png" /></a></span>	
				</td>
		<?php
				if ($a == 3) { ?>		
				<td>
					<span class="text"><a href="delete.php?id=<?php echo $row["id"];?>"><img src="/inventory/images/del.png" /></a></span>
				</td>
			<?php } ?>
			</tr>
<?php
	$i++;
	}
?>
</table>
<br />
</div>

<script src="activatables.js" type="text/javascript"></script>
<script type="text/javascript">
activatables('page', ['showitem', 'alert', 'invoice','search', 'bring', 'addpro', 'update', 'report', 'export']);
</script>