function toggle_cookie(cookie, state) {
	let xhr = new XMLHttpRequest();
	xhr.open('POST', set_session_url, true);
	xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	xhr.setRequestHeader('X-CSRFToken', csrf_token);
	xhr.send(cookie + '=' + state);
	}
function toggle_header() {
	if (document.getElementById('header').style.display == 'flex') {
		document.getElementById('header').style.display = 'none';
		document.getElementById('headerHidden').style.display = 'flex';
		toggle_cookie('hide_header', 'on');
	}
	else {
		document.getElementById('header').style.display = 'flex';
		document.getElementById('headerHidden').style.display = 'none';
		toggle_cookie('hide_header', 'off');
	}
}