MovieClip duration display

I have a controller that works well (play, pause, restart, and a scrubbing playhead), now I just need to display the time remaining vs. the total time of an external swf, preferably in MM:SS format (Ex: 02:36/03:51). I’m getting better with my ActionScripting all the time, but the more I learn, the more I realize just how little I actually know. Anyways, my files are setup as follows:
[LIST]
[]HTML w/ JavaScript that hides the main swf (giving it time to load)
[
]Main swf revealed when button is clicked on HTML page
[]External swf pulled into an empty MC (mcContent)
[
]Instance of controller in the main swf targets mcContent
[*]Dynamic text field labelled “txtTimer” is inside of controller waiting for the right script to display time remaining/total time[/LIST]So, anybody know where I could find some script to get this final touch added to my project? Either time elapsed or time remaining would be cool. I’ve gotten a lot of really good help/tips here in the past and am hoping to keep that going.
Thanks!
-VZ