vtype=["hidden","visible"];
function swin(ad){
Menu=document.all[ad].style;
Menu.visibility=vtype[Menu.visibility.indexOf("hidden")+1];
}


function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
btn_top_over = newImage("img/btn_top_over.gif");
btn_info_over = newImage("img/btn_info_over.gif");
btn_annai_over = newImage("img/btn_annai_over.gif");
btn_mame_over = newImage("img/btn_mame_over.gif");
btn_boseki_over = newImage("img/btn_boseki_over.gif");
btn_sakuhin_over = newImage("img/btn_sakuhin_over.gif");
btn_mail_over = newImage("img/btn_mail_over.gif");
	preloadFlag = true;
	}
}