Hey good news!
Unfortunately I'm really busy at the moment and it would take some time for me to properly code, test and teach you how to use and set up a groupx (you need a groupx not fieldx, because you need at a minimum a title plus an editor field for each page). Because that's a lot for me until next week, I'd suggest first setting up a more usual groupx.
If you want to practice first, create a test content type called gallery-x, and another called gallery. In gallery x, create an image field and a text field (for caption). Don't forget to place them in admin, site, content and intro. Then in the GALLERY content type, create a new group-x field and place it in the views you need it (I think at least admin and content). Create other fields for the fun of it. Next add some gallery articles to the gallery content type, and create a menu item to it. Then create a position override to make a custom template for at least the article (content) view. See the template help, there's plenty of info. This page explains how to call the groupx part:
www.seblod.com/support/documentation/seb...eldx-and-groupx.html
If you do the practice, I'll bet you'll start to get a good feel for what you need to do for your multi-page template.
Probably the best way to handle it would be to loop trough the groupx twice. First time for the menu, you would echo an <option> for each item in groupx, and add a $count++ to display the page number. Don't create a 3rd groupx for the bottom menu, try to put your html into a variable so you can reuse.
I think you'll need to loop through groupx a second time for the switch.
Last piece of advice for now, you might add a little more html markup to the template so you can style with css easier. Example:
<div class="topnav">
<form>
<select onchange="window.open(this.options[this.selectedIndex].value,'_top')">
<option value="">Go to page...</option>
<option value="<?php echo JURI::current(); ?>?page=1">Introduction</option>
<option value="<?php echo JURI::current(); ?>?page=2">Test report</option>
<option value="<?php echo JURI::current(); ?>?page=3">Conclusion</option>
</select>
</form>
</div>
and
case 1:
echo '<div class="page"> . '<h1>' . $cck->getValue('page_title_1') . '</h1>' . '<div class="page-text">' . $cck->getValue('art_fbody_1') . '</div></div>';
break;
Of course this will all change once you add the groupx, but that's the general idea. If you give it a shot and still need help, I'll be available again next week.