function showLogin(c) {
	document.getElementById('logincalendar').value = c;
	showWindow('login');
}

function showWindow(wname) {
	hideWindow();
	activewindow = document.getElementById(wname + 'window');
	if (activewindow) {
		activewindow.style.display = 'block';
		document.getElementById('coverlayer').style.display = 'block';
		document.getElementById('html').style.overflow = 'hidden';
		stopScroll = true;
	}
}

function hideWindow() {
	if (stopScroll = true) {
		if (activewindow) {
			activewindow.style.display = 'none';
			document.getElementById('coverlayer').style.display = 'none';
			document.getElementById('html').style.overflow = '';
			stopScroll = false;
		}
	}
}

function stopScrolling() {
	if (stopScroll) {
		window.scrollTo(0,0);
	}
}

var activewindow;

var stopScroll = false;
window.onscroll = stopScrolling;