//添加cookie
function setCookie(name,value) {
	var day = 365;//此cookie将保存365天
	var expires = new Date();
	expires.setTime(expires.getTime() + day * 1000 * 3600 * 24);
	document.cookie = name + "=" + escape(value) + ";path=/;expires=" + expires.toGMTString();
}
//获取cookie
function getCookie(name) {
	var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));
	if(arr != null) 
		return unescape(arr[2]);
	return null;
}
//删除cookie
function delCookie(name) {
    var cval = getCookie(name);
    if(cval != null)
    	document.cookie = name + "=;path=/;expires=Fri, 02-Jan-1970 00:00:00 GMT";
}