var preLoadFlag = "false";

	function preLoadImg(){
		arrImgList = new Array (
			"/misc/about_on.jpg","/misc/contact_on.jpg","/misc/info_on.jpg","/misc/company_on.gif",
			"/img/plan01_on.jpg","/img/plan02_on.jpg","/img/plan03_on.jpg","/img/plan04_on.jpg","/img/plan05_on.jpg","/img/plan06_on.jpg","/img/plan07_on.jpg","/img/plan08_on.jpg","/img/plan09_on.jpg","/img/plan10_on.jpg","/img/plan11_on.jpg","/img/plan12_on.jpg",
			"/misc/sub_price_on.gif","/misc/sub_timetable_on.gif","/misc/sub_discount_on.gif","/misc/sub_contact_on.gif","/misc/buy_payment_on.gif","/misc/buy_btn_on.gif","/misc/seat_on.gif","/misc/interior_on.gif","/misc/bus_button_on.jpg","/misc/reserve02_on.gif"
		);
		arrPreLoad = new Array();
		for (i in arrImgList) {
			arrPreLoad[i] = new Image();
			arrPreLoad[i].src = arrImgList[i];
		}
		preLoadFlag = "true";
	}

	function chgImg(fileName,imgName){
		if (preLoadFlag == "true") {
			document.images[imgName].src = fileName;
		}
	}