Cant get buttons to work after linking back

Question

I have built a flash page that links to html pages. The buttons in the flash movie also link to movie frames in the flash and external html pages. Once movie plays and stops, all links work fine, the links to the anchors and the links to the other html pages, however when I try and link back to the flash movie from an external html page, to specific frames in the flash movie, the html link will link back to flash movie frame fine, however once your back in the flash movie, none of the buttons in the movie work anymore.
I have embedded the flash movie in an HTML and published it with anchors,"home, about, events etc.
used this code for several buttons in the flash linking to frame anchors in the movie:
home_btn.addEventListener (MouseEvent.CLICK, handler);
function handler (event:MouseEvent):void
     gotoAndPlay (300, "Scene 1");
This code for the buttons to html pages in the movie:
members_btn.addEventListener (MouseEvent.CLICK, clickHandler);
function clickHandler (event:MouseEvent):void
     navigateToURL (new URLRequest ("http://plowonstore.com/members.html"), "_self");
And this code for the html link back to flash frame anchors:
<a href="http://plowonstore.com/flash/index.html#home">the button in html page<a/>
I can't get the buttons in the movie to work once you go back to flash from html links. What am I doing wrong?
I have search for days now... till I'm blue, can anybody steer me in the right direction please.
Thanks.

Answer 1

The flash is 410 frames main movie ends at 393. Buttons appear at lets say frame 115, so at frame 115 I have an action layer with the above code, and blocked(?) extended out all the way to frame 410. Every frame has the action panel showing that code. So like 295 frames its on? I did that beacause flash would not let me put code in layer on each frame more than once told me duplicate code. I would like the buttons to work as soon as they appear, but maybe not possible?
So when the movie runs and then stops (another layer with a stop(); on frame 393) everything works, if you link to frames 401, 402 etc, can link back and forth in flash movie no prob.
The frames 401, 402 are continuations of several layers of the main movie, and some additonal content layers just for those "pages". Each has an anchor layer, a content layer, continuing layers of main, and a stop(); layer for each.
So when you choose a button (in the movie) that takes you out of movie, to an HTML page and then try and link back to flash from that HTML page link, you get sent to correct page, frame, in the flash, but as you suggest and as I feared, the code is not being run. Buttons react to mouse but don't link anywhere.
http://plowonstore.com/flash
Any suggestions would be dearly appreciated.