function setCookie(cookieName, cookieValue, nDays) {
	 var today = new Date();
	 var expire = new Date();
	 if (nDays == null || nDays == 0) nDays = 1;
	 expire.setTime(today.getTime() + 3600000 * 24 * nDays);
	 document.cookie = cookieName + "=" + escape(cookieValue) + ";expires=" + expire.toGMTString() + ";path=/";
}

function readCookie(cookieName) {
	 var cookie = "" + document.cookie;
	 var index = cookie.indexOf(cookieName+ "=");
	 if (index == -1 || cookieName == "") return ""; 
	 var index1 = cookie.indexOf(';', index);
	 if (index1 == -1) index1 = cookie.length; 
		 return unescape(cookie.substring(index + cookieName.length + 1, index1));
}

function resetCookie(cookieName) {
	setCookie(cookieName, "", -1);
}