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

dasu=(ver==2)?"show":"visible";
kesu=(ver==2)?"hide":"hidden";

if(document.images){
	imgsmenu=new Array(13);
	for(i=0;i<13;i++){
		if(i+1<10) num_str="0"+(i+1);
		else num_str=i+1;
		imgsmenu[i]=new Array(2);
		imgsmenu[i][0]=new Image(); imgsmenu[i][0].src="menu/img/syobtn"+num_str+"_030401.gif";
		imgsmenu[i][1]=new Image(); imgsmenu[i][1].src="menu/img/syobtc"+num_str+"_030401.gif";
	}
}

var old_idnum="";
var old_ssub="";
function menuImgChng(idnum,on_off){
	img_nm="simg"+idnum;
	document.images[img_nm].src=imgsmenu[idnum-1][on_off].src;

	if((on_off==1)&&(old_idnum!="")&&(old_idnum!=idnum)){
		menuImgChng(old_idnum,0);
		smenu_hide();
	}
	if(on_off==1) old_idnum=idnum;
}

var obj_sid;
var obj_shu;
var obj_shs;
var obj_shd;
function smenu_show(id){
	obj_sid=(ver==1)?document.all[id]:(ver==2)?document.layers[id]:document.getElementById(id);
	obj_sid=(obj_sid.style)?obj_sid.style:obj_sid;
	obj_shu=(ver==1)?document.all["hide_su"]:(ver==2)?document.layers["hide_su"]:document.getElementById("hide_su");
	obj_shu=(obj_shu.style)?obj_shu.style:obj_shu;
	obj_shs=(ver==1)?document.all["hide_ss"]:(ver==2)?document.layers["hide_ss"]:document.getElementById("hide_ss");
	obj_shs=(obj_shs.style)?obj_shs.style:obj_shs;
	obj_shd=(ver==1)?document.all["hide_sd"]:(ver==2)?document.layers["hide_sd"]:document.getElementById("hide_sd");
	obj_shd=(obj_shd.style)?obj_shd.style:obj_shd;

	obj_sid.visibility=dasu;
	obj_shu.visibility=dasu;
	obj_shs.visibility=dasu;
	obj_shd.visibility=dasu;
	old_ssub=id;
}

function smenu_hide(){
	if(old_ssub!=""){
		obj_sid.visibility=kesu;
		obj_shu.visibility=kesu;
		obj_shs.visibility=kesu;
		obj_shd.visibility=kesu;
		menuImgChng(old_idnum,0);
		old_ssub="";
	}
}