function createCookie(name, value, days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
		var expires = "; expires=" + date.toGMTString();
	}
	else var expires = "";
	var ck = name + "=" + value + expires + "; path=/";
	document.cookie = ck;
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for (var i = 0; i < ca.length; i++) {
		var c = ca[i];
		while (c.charAt(0) == ' ') c = c.substring(1, c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name, "", -1);
}

function updateCookie(name, value) {
	eraseCookie(name);
	createCookie(name, value, 1);
}

function storePageHeight() {
	updateCookie("pageheight", document.body.parentNode.clientHeight);
}

window.onresize = storePageHeight;
window.onload = storePageHeight;