Error คุกกี้? หน้าLogin อีกแล้ว!!!! (คราวนี้เอาcode ฉบับเต็มมาให้)

<?php
function loginchk()
{
include("admin/id.php");
	$username=$_POST["username"];
	$password=$_POST["password"];
	if($username==NULL||$username=="/")
	{
	return 0;
	}
	$conn = mysql_connect($host, $user, $pw)or die("Can't Connect Database Server");
	$dbs = mysql_select_db($dbname) or die("Cant Connect to SQL");
	$command="SELECT password FROM account WHERE username='$username'";
	$tmp1 = mysql_query($command, $conn)or die("Can't get Password infomation");
	$cttmp2=mysql_fetch_array($tmp1);

	if($cttmp2[0]==$password)
	{
		return 1;
	}
	else
	{
		return 0;
	}	
	mysql_close;
}

include("admin/menubar.php");
if(loginchk()!=1)
{
echo "
<div id='hishadow'>
<center>
<form id='form' name='form' action='' method='post'>
<table width='34%' border='0'>
  <tr>
    <td width='50%'>username ::</td>
    <td width='50%'>
          <input type='text' name='username' id='username' />
    </td>
  </tr>
  <tr>
    <td>password ::</td>
    <td>
        <input type='password' name='password' id='password' />        
    </td>
  </tr>
</table>
<p>
<input name='send' type='hidden' id='send' value='1' />
  <label>
  <input type='submit' name='submit' id='submit' value='Log in' />
  </label>
</p>
</form>
</center>
</div>";
}
else
{

	include("admin/id.php");
	$conn = mysql_connect($host, $user, $pw)or die("Can't Connect Database Server");
	$dbs = mysql_select_db($dbname) or die("Cant Connect to SQL");
	$command="SELECT id FROM account WHERE username='$username'";
	$tmp1 = mysql_query($command, $conn)or die("Can't get id infomation");
	$igen=mysql_fetch_array($tmp1);
$strName=$_POST["username"];
setcookie("username",$strName,time()+3600);
setcookie("id",$igen[0],time()+3600);
	mysql_close;
echo "<center>ทำการ Login เรียบร้อยแล้ว<center>";
}


?>