How do i reset/add time to my delay?

programming flash
1

The code show’s the movieclip “nav” when “bg_inv” is clicked, and fades it out when 5 seconds have passed. What I want to achieve is this:

When I click a button inside “nav” called “next_btn” the delay needs to be reset, so that “nav” doesn’t fade out until five seconds have passed since I clicked the button.

Any help would be apreciated. :m2:

nav._visible = false;
import mx.transitions.Tween;
import mx.transitions.easing.*;


MovieClip.prototype.myProto =  function ()
{
    name=this._name;
    nav._alpha = 100;
    nav._x = Math.round(_xmouse-(nav._width/2));
    nav._y = Math.round(_ymouse-(nav._height/2));
    nav._visible = true;

    fncContinue = function () {
        var fadeNav:Tween = new Tween(nav, "_alpha", Strong.easeOut, 100, 0, 0.7, true);
        fadeNav.onMotionFinished = function() {
            nav._visible = false;
            bg_inv.onMouseDown = function() {
                bg_inv.myProto();
                delete this.onMouseDown;
            };
        };
        clearInterval(itvDelay);
    };
    itvDelay = setInterval(fncContinue, 5000);
}

bg_inv.onMouseDown = function() {
    bg_inv.myProto();
    delete this.onMouseDown;
};