function activeShow(obj){
	var bj=document.getElementById("activebj");	
	var sh=document.getElementById("activesh");
	var gz=document.getElementById("activegz");
	bj.style.display="none";
	sh.style.display="none";
	gz.style.display="none";
	switch(obj){
		case "bj":bj.style.display="";break;
		case "sh":sh.style.display="";break;
		case "gz":gz.style.display="";break;
		default:break;
	}

}