var ver;
if(document.all) ver=1;
else if(document.layers) ver=2;
else ver=3;


var old_tsub="";
var obj_tid;
var obj_thu;
var obj_thd;
function tmenu_show(id){
	tmenu_hide();
	obj_tid=(ver==1)?document.all[id]:(ver==2)?document.layers[id]:document.getElementById(id);
	obj_tid=(obj_tid.style)?obj_tid.style:obj_tid;
	obj_thu=(ver==1)?document.all["hideTop"]:(ver==2)?document.layers["hideTop"]:document.getElementById("hideTop");
	obj_thu=(obj_thu.style)?obj_thu.style:obj_thu;
	obj_thd=(ver==1)?document.all["hideBottom"]:(ver==2)?document.layers["hideBottom"]:document.getElementById("hideBottom");
	obj_thd=(obj_thd.style)?obj_thd.style:obj_thd;

	obj_tid.visibility="visible";
	obj_thu.visibility="visible";
	obj_thd.visibility="visible";
	old_tsub=id;
}

function tmenu_hide(){
	if(old_tsub!=""){
		obj_tid.visibility="hidden";
		obj_thu.visibility="hidden";
		obj_thd.visibility="hidden";
		old_tsub="";
	}
}