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 = "";
	document.cookie = name+"="+ value+expires +"; path=/";
}

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);
}