[snippet] js cookie operate

function(){

var setCookie= function (name,value)
{ 	var Days = 30;
var exp = new Date();
exp.setTime(exp.getTime() + Days*24*60*60*1000);
document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString()+";path=/";}
var getCookie=function(name)
{
var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");
if(arr=document.cookie.match(reg))return unescape(arr[2]);
else return null;}
var delCookie=function (name)
{ 	var exp = new Date();
exp.setTime(exp.getTime() - 1);
var cval=getCookie(name);
if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString()+";path=/";}
if(arguments[0]=="get") return getCookie(arguments[1]);
else if(arguments[0]=="del") return delCookie(arguments[1]);
else setCookie(arguments[0],arguments[1]);
}