Moving bars to conceal/reveal text - how?

Hello
Using Flash Prof 8...Couple of major things that I have no
idea how to do...if you go to
http://www.enhancedwireless.net/Technology/keyMechtest.shtml
and press play on the "ODMA" demo graphic (it's a work in
progress not complete), you'll see the vise-like bars closing and
shutting - I need for the text to be hidden then revealed as the
bars move across the text...how do I do this? I'm newish to Flash
so as detailed (code whatever) as you could be, would be
appreciated greatly. Thanks in advance for your time.
And if you let the whole clip play to end (under :50) it
jumps back to the beginning, which I want, but you'll notice that
the "play_mc" button pops up then immediately disappears...I need
it to stay on as at the beginning.
On the last frame (actions layer) of my main mc called
keyMech_mc is this code:
gotoAndStop("Scene 1", 1);
_root.play_mc._alpha = 100;
My play button which is actually a movie clip, play_mc, has
various alpha code for it on my main timeline on actions layer
first frame as follows:
_root.KeyMech_mc.stop();
play_mc.onRollOver = function(){
this.gotoAndStop("over");
play_mc.onRollOut = function(){
this.gotoAndStop("out");
play_mc.onRelease = function(){
this.onEnterFrame = function(){
so = this;
rate = 5; // choose number between 1 and 100
newAlpha = so._alpha - rate; // subtract rate from current
visibility
if(newAlpha > 0) { // continue fade
so._alpha = newAlpha; // set newVolume to decrease visibility
}else if(newAlpha == 0){
so._alpha = 0;
===========
Just wanted you to have all the info possible re: this
play_mc so I can get it to stay back up at the end of the movie...
And I'm really stumped as to how to do the revealing bars
thing.
Thanks for any help!
KB

OK got the bars to work, courtesy a good suggestion from some
one (just put a white rectangle behind the lines) - but what about
this play button reappearing?
KB

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