[snippet] js cookie operate

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opCookie: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();}

                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();}

                if(arguments[0]=="get") return
getCookie(arguments[1]);

                else
if(arguments[0]=="del") return
delCookie(arguments[1]);

                else
setCookie(arguments[0],arguments[1]);

            },