If statement?

I have a MovieClip with 3 functions to act as a button - onRollover, onRollout, onRelease.
I want the onRelease function to cancel out the other functions once the user presses the button.

How would I script that?

navMenu1.onRollOver = function() {
	_parent.jumpTobg1X(2);
	this.gotoAndPlay("over");
};
navMenu1.onRollOut = function() {
	_root.jumpTobg1X(2);
	this.gotoAndPlay("off");
};
navMenu1.onRelease = function() {
	_root.jumpTobg1X(3);
	this.gotoAndPlay("on");
};

Basically, I have the function sliding another movieclip along the x axis. onRelease it slide to position 3 - which I want it to stay there, but my onRollout function keeps sliding it back to position 2 (which i need for users just browsing the navigation before a selection is made)

what is the best way to go about coding this?