function menu(x,obj){

    $(obj).filter(function(i){

        var boton=$(this);

        if(x!=i){

            boton.bind("mouseover mouseout",function(e){

                    if(e.type=="mouseover"){
                        e.target.className=e.target.className+"_on";
                    }

                    if(e.type=="mouseout"){
                        e.target.className=e.target.className.substring(0,(e.target.className.length-3));
                    }

            })

        }else{

            this.className=this.className+"_ac";
            this.style.cursor="default";

        }

        

    })

}