<u>Admin Login</u><table border="0">
<tr>
<td><form name="form1" method="post" action="check.php">
<table width="407" border="0">
<tr>
<td width="105">Username:<br><input name="username" type="text" id="username"><br>
Password:<br><input name="password" type="password" id="password"></td>
</tr>
</table>
<br>
<input type="submit" name="Submit" value="Login">
</form>

</td>
</tr>
</table>

<?php
$admin1 = "admin1"; // first admin username
$adm_pass1 = "password1"; // first admin password

$admin2 = "admin2"; // second admin username
$adm_pass2 = "password2"; // second admin password

if(($username == $admin1 && $password == $adm_pass1) || ($username == $admin2 && $password == $adm_pass2)){
echo "Congratulations <i>" . $_POST['username'] . "</I><br>You may now proceed to the <a href=\"admin.php\">admin area</a>!";
}

else {
echo "Username <b>" . $_POST['username'] . "</b> or password <b>" . $_POST['password'] . "</b> is incorrect, please try again"; }
?>

$admin3 = "admin3"; // second admin username
$adm_pass3 = "password3"; // second admin password

|| ($username == $admin2 && $password == $adm_pass2) || ($username == $admin3 && $password == $adm_pass3)

It'd work, but is it really a good idea to store the admin passwords in an unencrypted file?