/**
*ÉèÖÃCookie
*var   yesterday   =   new   Date(now.getTime()   -   1000   *   60   *   60   *   24);   
*/
function setCookie(cookieName, cookieValue, expires, path, domain, secure) {
	document.cookie =
		escape(cookieName) + '=' + escape(cookieValue)
		+ (expires ? '; expires=' + expires.toGMTString() : '')
		+ (path ? '; path=' + path : '')
		+ (domain ? '; domain=' + domain : '')
		+ (secure ? '; secure' : '');
}

/**
*»ñµÃCookie
*/
function getCookie(cookieName) {
	var cookieValue = '';
	var posName = document.cookie.indexOf(escape(cookieName) + '=');
	if (posName != -1) {
		var posValue = posName + (escape(cookieName) + '=').length;
		var endPos = document.cookie.indexOf(';', posValue);
		if (endPos != -1) cookieValue = unescape(document.cookie.substring(posValue, endPos));
		else cookieValue = unescape(document.cookie.substring(posValue));
	}
	return (cookieValue);
}

/**
*Çå³ýCookie
*/
function clearCookie(cookieName){
	var expdate = new Date();
	expdate = new Date(expdate.getTime()-1000*60*60*24);
	setCookie(cookieName,'',expdate,"/");
}