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

function delCookie (NameOfCookie) 
{
	if (getCookie(NameOfCookie)) {
		document.cookie = NameOfCookie + "=" +
			"; expires=Thu, 01-Jan-70 00:00:01 GMT";
	}
}

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)); } 
		} else {
			return null;
		}
}