function createCookie(name,value,days) {

    var date, expires;

	if (days) {
		date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		expires = "; expires="+date.toGMTString();
	}
	else expires = "";

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

}

function readCookie(name) {

	var nameEQ = name + "=",
        ca = document.cookie.split(';'),
        c,
        i;

	for(i = 0; i < ca.length; i++) {
		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);

}