function tab(i) {
	document.getElementById("events").style.display = (i == "on-events") ? "block" : "none";
	document.getElementById("tickets").style.display = (i == "on-tickets") ? "block" : "none";
	document.getElementById("promo").style.display = (i == "on-promo") ? "block" : "none";
	
	document.getElementById("tabs").className = i;
}