$(function(){
    $("#center-title").find("div").each(function(i){
            var obj = this;
            $(this).bind("click",
                    function(){
                        $("#center-title").find("div").each(function(j){
                            if(this.id == obj.id)
                            {
                                this.className = this.id + "2";
                                $("#div" + this.id).css("display","block");
                                $(this).find("a").css("color","#000");
                            }
                            else
                            {
                                this.className = this.id;
                                $("#div" + this.id).css("display","none");
                                $(this).find("a").css("color","#636363");
                            }
                        });
                     });
    });
});