function rolloverimg(img, sw){
	var fname = img.src.substring(0, img.src.length - 4);
	if (sw == 'on' && fname.substring(fname.length - 2, fname.length) != '_o' ){
		img.src = fname + '_o.jpg';
	}else if(sw == 'off' && fname.substring(fname.length - 2, fname.length) == '_o'){
		img.src = fname.substring(0, fname.length - 2) + '.jpg';
	}
}

function loadimage(obj, val){
	var d = document;
	var img = obj;
	d.img = new Image();
	d.img.src = val;
}

function preload(){
	loadimage('image01', './images/tsutomu_o.jpg');
	loadimage('image02', './images/teddy01_o.jpg');
	loadimage('image03', './images/flier_o.jpg');
	loadimage('image04', './images/keiko_o.jpg');
	loadimage('image05', './images/teddy02_o.jpg');
	loadimage('image06', './images/teddy03_o.jpg');
	loadimage('image07', './images/miho_o.jpg');
	loadimage('image08', './images/teddy04_o.jpg');
	loadimage('image09', './images/taizo_o.jpg');
	loadimage('image10', './images/teddy05_o.jpg');
	loadimage('image11', './images/teddy06_o.jpg');
	loadimage('image12', './images/teddy07_o.jpg');
	loadimage('image13', './images/teddy08_o.jpg');
	loadimage('image14', './images/teddy09_o.jpg');
}