function getCookie(NameOfCookie) { 
	if (document.cookie.length > 0) { 
		begin = document.cookie.indexOf(NameOfCookie+"=");
		if (begin != -1) {
			begin += NameOfCookie.length+1;
			end = document.cookie.indexOf(";", begin);
			if (end == -1) {
				end = document.cookie.length;
			}
			return unescape(document.cookie.substring(begin, end));
		}
	}
	return null;
}

function setCookie(NameOfCookie, value, expiredays, domain) { 
	var ExpireDate = new Date ();
	var DomainString = "";
	
	ExpireDate.setTime(ExpireDate.getTime() + (expiredays * 24 * 3600 * 1000));
	if (domain) {
		DomainString = "; domain=" + domain; // : "" 
	}
	document.cookie = NameOfCookie + "=" + escape(value) + ((expiredays == null) ? "" : "; path=/; expires=" + ExpireDate.toGMTString()) + DomainString;
}

function delCookie (NameOfCookie) { 
	if (getCookie(NameOfCookie)) {
		document.cookie = NameOfCookie + "=" + "; expires=Wed, 24-Oct-79 00:00:01 GMT";
	}
}