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// display navigation if necessary

if ($disp_nav == true)

{

echo ‘<a href=”catalog.html”>Visit our catalog page!</a>’;

}

}

?>

5.

This is the moment of truth. Load

http://seophp.example.com/catalog.html

, and click

the popup link. No navigation should show up. If you get to the popup page through Google,

Yahoo!, or MSN, or if you load

http://seophp.example.com/popup.php

directly from the

address bar of your browser, the navigation link should appear (see Figure 6-2).

6.

Now is a great time to test the RefControl Firefox plugin mentioned in Chapter 2. This plugin

allows you to display and modify REFERER information. Install the plugin and navigate to

http://seophp.example.com/catalog.html

. In the page, click the link that opens the

popup window, and note the HTTP REFERER displayed in the status bar (see Figure 6-3). You

can see that the catalog link doesn’t show up when the popup is opened as a result of naviga-

tion from within your site.

Figure 6-2

126

Chapter 6: SE-Friendly HTML and JavaScript

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