Re activating script after stop();

Question

How do I stop a script from running, or remove it from a swf at a specific frame, (on its own layer "actions") and then start it again, or script it again on another frame further down the timeline?
If I try and put the same script on another layer, past the stop(); or anywhere for that matter, flash gives me a duplicate function definition error.
Lets say my swf is embedded in an html and its url is abc.com. When you navigate to that url the swf plays, all scripts work, buttons work to link to frame anchors back and forth within the swf and all is fine. As long as you remain at abc.com and link with a gotoAndPlay(frame), or gotoAndStop(frame) function from the script internally in the swf.
However lets say one of those buttons goes to dce.com (urlRequest... dce.com...) essentially navigating away from the swf, .and at dce.com there is a link to go back to abc.com/index.html#frame, when you choose to navigate back to that frame in the swf, it does, but the script no longer works.
The script is on all anchor frames, and works intially in the swf when you play the movie for the first time, the movie stops (stop();) at a specific frame, and continues to navigate around to specific frame anchors and back and forth, the script continues to work as long as you are within the movie so to speak. However if you decide to go to dce.com, essentially leaving the movie and then at dce.com there is a link back to a specific frame, when I link back to the swf, from dce.com, the script no longer functions?
I cannot imagine this is not something that quite a few people use, a combination of flash pages and html pages and interlinking them back and forth, I just cannot find ANY info searching exhaustively on why the script will not work after returning to a swf frame after navigating away to anywhere else and then back to the swf frame needed.
Been searching, posting, reading anything and everything, everywhere, in every concievable description I can muster.
If someone could just point me in the right direction, to the right info, I will do the homework, I will do the work, please just point.

Answer 1

Yes that is correct, I am navigating from a link on an html page to a specific frame in flash. They are two entirely seperate documents on a server in two completely different directories.
Maybe this is why it is so difficult to find an answer.
The code is simple, create the anchor points in the swf, then in the publish settings choose html tab then choose "flash with html anchors" in template type (CS4-AS3), flash creates anchors in the body code of the html container it creates: <a name="about"></a> those are accessable from "outside" the swf by a hyperlink: <a href="http://thesite.com/index.html#about">The about frame of an swf contained in the index.html, from an external html page</a>
The problem is as described, and I don't think I'm being clear, nobody seems to understand what I'm saying. When I navigate to the url container that plays the movie start to finish, all works perfectly. It even links from the external html pages precisely back to the designated frame, the only thing is the script no longer fuctions, buttons react, but do not call the functions, nor it seems listen anymore.
I have structured the action layers pretty much as you outlined, I have the mouse event script on the first frame as the buttons all the way out to the last frame of the movie, including the frames past the stop(); that hold the about, event, etc content. And I have seperate script layers for specific stop points and anchor points along the way.
Go here, http://plowonstore.com/flash click on the about, events, and news buttons, then click back to home, all play proper frames, all buttons fuction perfectly, then after that click on an external link (outside the swf) to the members page, which is an html page in a different directory, again it links the urlrequest perfectly, now here is the issue, once you choose a similar button on the html page, say click the about button, again you will be taken back to the swf, to that specific frame anchor "about", which it will take you to.
Heres where the issue is, now once back in the swf, the script is no longer active, or loaded, or running, I have only been building with flash for a month so I don't know proper terminology yet.
If I put the mouse event script on the frames that hold the about events etc, it will work on the "link back" but not when the movie runs, because the movie actually stops before the frames in question.
Now flash for some reason will not let me run the same code twice, on any frame anywhere in the movie regardless of seperate frames, layers etc.
So I think the code is still loaded and listening when the movie stops. That's why I asked how to maybe unload/remove script, and then add it again on specific frames kind of like you clear and remove certain code when done, then call again when needed.
I just don't know and can't find anyone anywhere who seems to know what I'm asking for.