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

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