the code for each menu item is HTML code.
using PHP commenting syntax:
//
will not work for HTML code, that will only work for PHP code that is between opening php tags:
<?php
and closing php tags:
?>
this is an example of a valid PHP comment:
<?php
//$foo = "bar";
?>
<h1>Header</h1>
this is not:
<?php
//$foo = "bar";
?>
//<h1>Header</h1>
to comment the HTML <h1> tag in the previous example, you would need to use an HTML comment:
<?php
//$foo = "bar";
?>
<!--<h1>Header</h1>-->
I'm betting that you are using PHP commenting syntax on HTML code, for example:
//<li><a href="../../../admin_pm/mailing_groups.php">Groups</a></li>
when you should be using HTML commenting syntax:
<!--<li><a href="../../../admin_pm/mailing_groups.php">Groups</a></li>-->
just because the menu file is a php file, it does not mean that all of the code in it is PHP code.