function setCookie(c_name, value, expiredays){ //设置cookie函数
var exdate=new Date();
exdate.setDate(exdate.getDate()+expiredays);
document.cookie=c_name+ "=" +escape(value)+
((!expiredays) ? "" : ";expires="+exdate.toGMTString()) ;//+ ';domain=' + Cookie_Domain + '; path=/';
}
function getCookie(name){
var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
if(arr) return unescape(arr[2]); return null;
}
function delCookie(name){ //删除cookie
var exp = new Date();
exp.setTime(exp.getTime() - 1);
var cval=getCookie(name);
if(cval) document.cookie= name + "="+cval+";expires="+exp.toGMTString();
}