$.extend({
    'cookie':function(){
        var len = arguments.length, c = arguments[0], v = arguments[1], t = arguments[2];
        var cur = '';
        if(len == 1){
            if(typeof c == 'object'){
                for (i in c){
                    if(typeof c[i] == 'object'){
                        if(c[i].length >= 2){
                            var exp = new Date();
                            exp.setTime(exp.getTime() + c[i][1]*1000);
                            cur = (i +'='+ escape(c[i][0]) +';expires='+ exp.toGMTString())
                            document.cookie = cur;
                        }
                        else{
                            cur = (i +'='+ escape(c[i][0]))
                            document.cookie = cur;
                        }
                    }
                    cur += (i +'='+ escape(c[i]));
                    document.cookie = cur;
                }
            }
            else{
                var cookieString = document.cookie;
                var start = cookieString.indexOf(c + '=');
                if (start == -1)
                    return null;
                start += c.length + 1;
                var end = cookieString.indexOf(';', start);
                if (end == -1)
                    return unescape(cookieString.substring(start));
                return unescape(cookieString.substring(start, end));
            }
        }
        else if(len == 3){
            var exp = new Date();
            exp.setTime(exp.getTime() + t*1000);
            cur = (c +'='+ escape(v) + ';expires='+ exp.toGMTString());
           document.cookie  =  cur;
        }
        else if(len == 2){
            cur = (c +'='+ escape(v));
            document.cookie  =  cur;
        }
        else{
            return document.cookie;
        }
    }
})