function getCookie(NameOfCookie){ 
	if (window.document.cookie.length > 0) { 
		begin = window.document.cookie.indexOf(NameOfCookie+"="); 
		if (begin != -1) { 
			begin += NameOfCookie.length+1; 
			end = window.document.cookie.indexOf(";", begin);
			if (end == -1) end = window.document.cookie.length;
			return unescape(window.document.cookie.substring(begin, end)); 
		} 
	}
	return null; 
}
function delCookie (NameOfCookie){ 
	if (getCookie(NameOfCookie)) {
		window.document.cookie = NameOfCookie + "=" + "; expires=0";
//		window.document.cookie = NameOfCookie + "=" + "; expires=Thu, 01-Jan-70 00:00:01 GMT";
	}
}
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=/;";
}