function SetCookie(name,value)//两个参数，一个是cookie的名子，一个是值
{
??? var Days = 30; //此 cookie 将被保存 30 天
??? var exp = new Date();??? //new Date("December 31, 9998");
??? exp.setTime(exp.getTime() + Days*24*60*60*1000);
??? document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}
function getCookie(name)//取cookies函数???????
{
??? var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
???? if(arr != null) 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!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString();
}