(when pressed) button question

I am trying to creating buttons using movie clips (so I can have rollOver/rollOut animation) in a Flash website and I was curious to know how to make a button, when pressed, stay that shape or color until another section of the page is visited. An example is at: www.fluidesign.com.

I know how to create Rollover/Rollout animation using:

stop();

this.onEnterFrame = function(){
if(rewind == true){
prevFrame();
}
}

this.onRollOver = function(){
rewind = false;
play();
}

this.onRollOut = function(){
rewind = true;
}

But again, I want to have the shape or color of the button, when pressed, stay that way until another section of the page is accessed. Can anyone lend a hand?