PHP includes not showing in page

Hello - I am new to these forums, but I could really use some help with this problem.
I have a menu that lists a bunch of items (unordered list). I need these items to appear (image and description) inside a specific div on my page, when they are chosen in the menu (clicked).

The main page code is this :

	<title>Page Title</title>	
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"/>

<link rel="stylesheet" href="style.css" type="text/css" media="screen" />

<script src="menu.js" type="text/javascript"></script>

<div id="container">
    <div id="topBar">
     <div class="innertext"><h1>Retail Display Fittings</h1>
      <img src="images/header1.jpg" />
     </div><!-- close innertext -->
    </div><!-- close topBar --> 

  <div id="leftMenu">
	<?php include_once "menu.php"; ?>
	  	<script type="text/javascript">
  </div><!--close leftMenu -->
	  <div id="mainContent">
  	  <div class="clear"></div>
	   <div id="interiorPages">
	    <img src="images/showroom1.jpg" />
<?php include_once "interior.php"; ?>

     </div><!-- close interiorPages -->
     <div class="clear"> </div>
  </div><!-- close mainContent -->

 <?php include_once "footer.php"; ?>	

 </div><!-- close container --> -->

The code for interior.php (line 34 above) is this:

	if(($id == "slatwall") && ($product == "slatwall")) {
	else if(($id == "slatwall") && ($product == "1205")) {
	else if(($id == "slatwall") && ($product == "1213")) {
	else if(($id == "slatwall") && ($product == "1214")) {
	else if(($id == "slatwall") && ($product == "1215")) {
	else if(($id == "slatwall") && ($product == "2800")) {
	else if(($id == "slatwall") && ($product == "2802")) {
 	else if(($id == "slatwall") && ($product == "2804")) {

and so on…

the code for the individual interior pages , e.g. 2804-hangrail-bracket.php is what I want displayed in the div:

   <p class="prod_img"><img src="../images/2804t.gif" /></p>

<div class="clear"> </div>

   <h1 class="prod_name"> 2804 HANGRAIL BRACKET</h1>
   <p class="prod_desc"> 1&quot;&amp;1 1/16&quot;
        round tubing or<br>
        1 1/4&quot; &amp; 1 5/16&quot; round tubing<br>
        chrome only</p>

<div class="clear"> </div>

ALL the pages are saved as .php files.

I cannot get the content to show in the div - and I am not getting any error messages, just nothing happens. All the files are in the same folder. And if I right-click on the menu they will open in a new page or tab, but they do not show in the same page in the div when the menu is clicked.

I hope I have been clear - I am fairly new to PHP and I’m sure there is a silly error somewhere in the code but I can’t find it. I’ve been searching, reading tutorials and forums for over a week now, can’t solve this.

Thanks for any help,

I am pretty sure the content is equivalent, because when I right-click on the menu they will load into a new tab or page - they just don’t load into the page where I want them.
I’ll try an echo for an error messasge for empty values and see what i get…

Have you tried to echo or print the values of $_GET[‘id’] or $_GET[‘product’] to make sure they are equivalent to what you are checking for?

You don’t have an ultimate else{} option, so if they don’t match what you are looking for, nothing is going to show up.