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);
}