cookie

var QQ = {};
QQ.Cookie={
    set:function(name,value,expires,path,domain){
        if(typeof expires=="undefined"){
            expires=new Date(new Date().getTime()+3600*1000);
        }
        document.cookie=name+"="+escape(value)+((expires)?"; expires="+expires.toGMTString():"")+((path)?"; path="+path:"; path=/")+((domain)?";domain="+domain:"");
    },
    get:function(name){
        var arr=document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
        if(arr!=null){
            return unescape(arr[2]);
        }
        return null;
    },
    clear:function(name,path,domain){
        if(this.get(name)){
            document.cookie=name+"="+((path)?"; path="+path:"; path=/")+((domain)?"; domain="+domain:"")+";expires=Fri, 02-Jan-1970 00:00:00 GMT";
        }
    }
};