var tileDelays = {cur: -1, time:[0.15, 0, 0.3, 0.1, 0.2, 0.05, 0.25, 0.15, 0]};

function menuToggle() {
	var mm = document.getElementById('menu');
	if (!mm) return;

	if (mm.classList.contains('menu0')) {
		mm.classList.remove('menu0');
	} else {
		mm.classList.add('menu0');
	}
}

function TileDelay() {
	tileDelays.cur++;
	if (tileDelays.cur==tileDelays.time.length) tileDelays.cur = 0;

	return tileDelays.time[tileDelays.cur];
}

function CssRemove(box, coef, id, css, delay = 0) {
	var obj = document.getElementById(id);
	if (!obj || !obj.classList.contains(css)) return;

	if (coef==0 || isVisible(box, coef)) {
		if (delay!='') {
			obj.style.transitionDelay = delay + 's';
			setTimeout(function() {document.getElementById(id).style.transitionDelay = null}, delay * 1000 + 50);
		}

		obj.classList.remove(css);
	}
}

function isVisible(id, coef) {
	var obj = document.getElementById(id);
	if (!obj) return false;

	var objTop = OffsetTop(obj);
	var objBottom = objTop + obj.offsetHeight * (1 - coef);
	objTop += obj.offsetHeight * coef;

	return (objTop<window.pageYOffset + window.innerHeight) && (window.pageYOffset<objBottom);
}

function OffsetTop(obj) {
	var offset = obj.offsetTop;
	while (obj.offsetParent) {
		obj = obj.offsetParent;
		offset += obj.offsetTop;
	}

	return offset;
}