Problem using Include Function with PHP5/Apache2.0/W2K3 Server

I am new to PHP and Apache. I am trying to use the include function to include a file that has my web page header and menu, similar to what I used to do with SSI. So I have a file called menu.inc that is in the /includes folder off of the doc root. the file has HTML in it to display a menu and header IN my main page, I have the line <?php include("/includes/menu.inc"); ?> Which I would expect to insert the HTMP from menu.inc at the location of the line of code. The content of the include file doesn't display. Instead, I get a link that says function.main and below that I get a link that says function.include I can run other PHP code with no problem. The include files are in a folder below the doc root called Includes. This is running on Windows 2003 Server. I did a default install of Apache 2.0 and PHP 5. This is probably a settig in httpd.conf or php.ini but I can't seem to find it in the docs. Any help would be greatly appreciated. Thanks in advance, David