ActionScript 3.0 :: Reset Page Sequence In E-Learning App?

I am just starting to get comfortable using as3 to create e-learning applications. I have this xml file that has a list of swf files that gets called(loaded) into a holder_mc when the user clicks on the forward btn or the back btn. Pretty simple...and it is working nicely at the moment.
 
I also have another loaded swf that has a menu which contains linkages to 8 chapters. Basically, when the user clicks on a link in the menu it takes them to a specific location in the course.
 
Here is the issue: example: let's say the user is on page 4, in the course, and decides to click on the menu and jump to page 28. After jumping to page 28, if the user clicks the forward button, the application takes them to page 5, instead of page 29. So, how do i write a script, and/or change the xml file so that the "forward" btn takes the user to page 29, instead of page 5? I think some kind of reset function needs to happen either in the as3 script or the xml file, but i'm not sure how to do that.
 
Here is the xml file sample:(this is a short sample of the xml file)
 
<course>
<page>
<file>welcome.swf</file>
</page>

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