adding another button causes problems

[OGGordon]

hey guys,

so i downloaded this template and it has 3 buttons on the navigation. i added another one and in the AS i added it but for some reason now the entire navigation doesnt work.

Here is the code of one button:

onClipEvent (load) {
	num = 2;
	this.hitArea=area;
	title1.gotoAndStop(num);
	title2.gotoAndStop(num);
	title3.gotoAndStop(num);
	title4.gotoAndStop(num);
}
on (rollOver) {
	if (_root.link<>num) {
		this.gotoAndPlay("s1");
	}
}
on (releaseOutside, rollOut) {
	if (_root.link<>num) {
		this.gotoAndPlay("s2");
	}
}
on (release) {
	if (_root.link<>num and _root.animation == 1) {
		_root.animation = 0;
		_root.link_prev = _root.link;
		_parent["item"+_root.link].gotoAndPlay("s2");
		_root.link = num;
		_root.play();
	}
}

I just changed "num=2" to 1,3,4 for each button. Im not sure what i am doing wrong.