// JavaScript Document
var menubg=new Array(
	"image/menu_bg.jpg",
	"image/menu_bg_01on.jpg",
	"image/menu_bg_02on.jpg",
	"image/menu_bg_03on.jpg",
	"image/menu_bg_04on.jpg",
	"image/menu_bg_05on.jpg",
	"image/menu_bg_06on.jpg",
	"image/menu_bg_07on.jpg",
	"image/menu_bg_08on.jpg",
	"image/menu_bg_09on.jpg"
);
//初期設定
function setBGList(id, num){
	photoNum = num;
	simplePreload(menubg);
	setBgIMG(0);
}

//画像の先読み
function simplePreload(phList){ 
 document.imageArray = new Array(phList.length);
 for(var i=0; i<phList.length; i++){
   document.imageArray[i] = new Image;
   document.imageArray[i].src = phList[i];
	}
}

//背景画像変更
function setBgIMG(id, fileNum){
	var obj = document.getElementById(id);
 obj.style.backgroundImage = "url("+menubg[fileNum]+")";
 obj.style.backgroundPosition = "left";
 obj.style.backgroundRepeat = "no-repeat";
}

setBGList("LeftMenu", 0);