/* image file preload */

if(document.images) {
	var imgs = new Array();
	imgs[0] = new Image(); imgs[0].src = "http://www.akibaoo.com/sys/img/btn_h_back.gif";
	imgs[1] = new Image(); imgs[1].src = "http://www.akibaoo.com/sys/img/btn_h_back_over.gif";
	imgs[2] = new Image(); imgs[2].src = "http://www.akibaoo.com/sys/img/btn_h_top.gif";
	imgs[3] = new Image(); imgs[3].src = "http://www.akibaoo.com/sys/img/btn_h_top_over.gif";
	imgs[4] = new Image(); imgs[4].src = "http://www.akibaoo.com/sys/img/btn_h_okaimono.gif";
	imgs[5] = new Image(); imgs[5].src = "http://www.akibaoo.com/sys/img/btn_h_okaimono_over.gif";
}

function chgimg(id, imgname) {
	if(document.images) {
		if(imgs[imgname]) {
		document.images[id].src = imgs[imgname].src;
        } else {
        document.images[id].src = imgname;
        }
    }
}