var nenkan_on =  new Image();
var nenkan_off =  new Image();
nenkan_on.src = "image/v_nenkan.gif";
nenkan_off.src = "image/nenkan.gif";

var zukyo_on =  new Image();
var zukyo_off =  new Image();
zukyo_on.src = "image/v_zukyo.gif";
zukyo_off.src = "image/zukyo.gif";

var event_on =  new Image();
var event_off =  new Image();
event_on.src = "image/v_event.gif";
event_off.src = "image/event.gif";

var keiji_on =  new Image();
var keiji_off =  new Image();
keiji_on.src = "image/v_keiji.gif";
keiji_off.src = "image/keiji.gif";

var link_on =  new Image();
var link_off =  new Image();
link_on.src = "image/v_link.gif";
link_off.src = "image/link.gif";

var otanosimi_on =  Image();
var otanosimi_off =  Image();
otanosimi_on.src = "image/v_otanosimi.gif";
otanosimi_off.src = "image/otanosimi.gif";

var toi_on =  new Image();
var toi_off =  new Image();
toi_on.src = "image/v_toi.gif";
toi_off.src = "image/toi.gif";

var back_on =  new Image();
var back_off =  new Image();
back_on.src = "image/v_back.gif";
back_off.src = "image/back.gif";

function on1(targetimage){
	if(targetimage=="menu1"){
	document.images[targetimage].src=nenkan_on.src;
	}
}

function off1(targetimage){
	if(targetimage=="menu1"){
	document.images[targetimage].src=nenkan_off.src;
	}
}

function on2(targetimage){
	if(targetimage=="menu2"){
	document.images[targetimage].src=zukyo_on.src;
	}
}

function off2(targetimage){
	if(targetimage=="menu2"){
	document.images[targetimage].src=zukyo_off.src;
	}
}

function on3(targetimage){
	if(targetimage=="menu3"){
	document.images[targetimage].src=event_on.src;
	}
}

function off3(targetimage){
	if(targetimage=="menu3"){
	document.images[targetimage].src=event_off.src;
	}
}

function on4(targetimage){
	if(targetimage=="menu4"){
	document.images[targetimage].src=keiji_on.src;
	}
}

function off4(targetimage){
	if(targetimage=="menu4"){
	document.images[targetimage].src=keiji_off.src;
	}
}

function on5(targetimage){
	if(targetimage=="menu5"){
	document.images[targetimage].src=link_on.src;
	}
}

function off5(targetimage){
	if(targetimage=="menu5"){
	document.images[targetimage].src=link_off.src;
	}
}

function on6(targetimage){
	if(targetimage=="menu6"){
	document.images[targetimage].src=otanosimi_on.src;
	}
}

function off6(targetimage){
	if(targetimage=="menu6"){
	document.images[targetimage].src=otanosimi_off.src;
	}
}

function on7(targetimage){
	if(targetimage=="menu7"){
	document.images[targetimage].src=toi_on.src;
	}
}

function off7(targetimage){
	if(targetimage=="menu7"){
	document.images[targetimage].src=toi_off.src;
	}
}

function on8(targetimage){
	if(targetimage=="menu8"){
	document.images[targetimage].src=back_on.src;
	}
}

function off8(targetimage){
	if(targetimage=="menu8"){
	document.images[targetimage].src=back_off.src;
	}
}