function SetCookie(name,value)//两个参数，一个是cookie的名子，一个是值
{
var Days = 1; //此 cookie 将被保存 1 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;
	if(arr != null) return 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();
}


//调用
//SetCookie ("xiaoqi", "3")
//alert(getCookie('xiaoqi'));