function chkLogin() {
	var oldLogin;
	var newLogin;

	oldLogin = document.getElementById('loginbox').style.display;
	document.getElementById('registerbox').style.display = 'none';

	if (oldLogin == 'block') {
		newLogin = 'none';
	} else {
		newLogin = 'block';

		var newWidth;
		newWidth = ((screen.width - 1000) / 2) + 700;

		document.getElementById('loginbox').style.position = 'absolute';
		document.getElementById('loginbox').style.top = '16px';
		document.getElementById('loginbox').style.left = newWidth+'px';
		document.getElementById('loginbox').style.padding = '5px';
		document.getElementById('loginbox').style.margin = '10px';
		document.getElementById('loginbox').style.zIndex = '100';
		document.getElementById('loginbox').style.backgroundColor = '#e5ecf9';
		document.getElementById('loginbox').style.border = '1px solid #97acd4';
		document.getElementById('loginbox').style.opacity = '0.9';
	}

	document.getElementById('loginbox').style.display = newLogin;

	return false;
}

function chkRegister() {
	var oldLogin;
	var newLogin;

	oldLogin = document.getElementById('registerbox').style.display;
	document.getElementById('loginbox').style.display = 'none';

	if (oldLogin == 'block') {
		newLogin = 'none';
	} else {
		newLogin = 'block';

		var newWidth;
		newWidth = ((screen.width - 1000) / 2) + 700;

		document.getElementById('registerbox').style.position = 'absolute';
		document.getElementById('registerbox').style.top = '16px';
		document.getElementById('registerbox').style.left = newWidth+'px';
		document.getElementById('registerbox').style.padding = '5px';
		document.getElementById('registerbox').style.margin = '10px';
		document.getElementById('registerbox').style.zIndex = '100';
		document.getElementById('registerbox').style.backgroundColor = '#e5ecf9';
		document.getElementById('registerbox').style.border = '1px solid #97acd4';
		document.getElementById('registerbox').style.opacity = '0.9';
	}

	document.getElementById('registerbox').style.display = newLogin;

	return false;
}

function chkAdmin() {
	var oldLogin;
	var newLogin;

	oldLogin = document.getElementById('adminbox').style.display;

	if (oldLogin == 'block') {
		newLogin = 'none';
	} else {
		newLogin = 'block';

		var newWidth;
		newWidth = ((screen.width - 1000) / 2) + 800;

		document.getElementById('adminbox').style.position = 'absolute';
		document.getElementById('adminbox').style.top = '16px';
		document.getElementById('adminbox').style.left = newWidth+'px';
		document.getElementById('adminbox').style.padding = '5px';
		document.getElementById('adminbox').style.margin = '10px';
		document.getElementById('adminbox').style.zIndex = '100';
		document.getElementById('adminbox').style.backgroundColor = '#e5ecf9';
		document.getElementById('adminbox').style.border = '1px solid #97acd4';
		document.getElementById('adminbox').style.opacity = '0.9';
		document.getElementById('adminbox').style.width = '150px';
	}

	document.getElementById('adminbox').style.display = newLogin;

	return false;
}