[Old Pedant]

It looks to me like you can just remove that entire 'onLoad' section. You can see that the last thing it does is call t.tabShow() with the cookie-remember tab number, so presumably removing it will eliminate tabbing to the prior tab.

That is, remove this code:

	'onLoad': function(argsObj) {
		var t = argsObj.tabber;
		var i;
		if (t.id) {
			t.cookie = t.id + t.cookie;
		}
		i = parseInt(getCookie(t.cookie));
		if (isNaN(i)) {
			return;
		}
		t.tabShow(i);
	},

Give it a shot, at least.