var image_render = {

	interval: 4350,
	timer: null,
	counter: 1,


	img_a: '',
	img_b: '',
	img_c: '',
	img_d: '',

	time_a: 340,//470,
	time_b: 655,//500,
	time_c: 970,//530,
	time_d: 1285,//560,

	timer_a: null,
	timer_b: null,
	timer_c: null,
	timer_d: null,


	start: function() {
		image_render.image_selector();
		image_render.timer = setInterval(image_render.image_selector, image_render.interval);
	},

	stop: function() {
		clearInterval(image_render.timer);
	},


	image_selector: function() {

	var a='';
	var b='';
	var c='';
	var d='';

//	var img_a='';
//	var img_b='';
//	var img_c='';
//	var img_d='';


//	a10= 1;
//	a1 = 1;
//	b10= 0;
//	b1 = 1;
//	c10= 0;
//	c1 = 1;
//	d10= 0;
//	d1 = 1;

	daytime = new Date();
	year = daytime.getYear();
	month = daytime.getMonth();
	day = daytime.getDay();
	hour = daytime.getHours();
	min = daytime.getMinutes();
	sec = daytime.getSeconds();
	msec = daytime.getMilliseconds();


	if( 0 <= hour && hour < 6 ) {
		a10='1';
		b10='0';
		c10='0';
		d10='0';
	} else if( 6 <= hour && hour < 12 ) {
		a10='0';
		b10='1';
		c10='0';
		d10='0';
	} else if( 12 <= hour && hour < 18) {
		a10='0';
		b10='0';
		c10='1';
		d10='0';
	} else if( 18 <= hour && hour < 24) {
		a10='0';
		b10='0';
		c10='0';
		d10='1';
	}


	if(a10 != 1) {
		a1 = (day + hour + sec * msec) % 9 +1;
	} else {
		a1 = (month + sec + msec) % 9;
	}

	if(b10 != 1) {
		b1 = (day + min + sec * msec + msec) % 9 +1;
	} else {
		b1 = (day + sec + msec) % 9;
	}

	if(c10 != 1) {
		c1 = (sec + msec + msec) % 9 +1;
	} else {
		c1 = (hour * min + sec + msec) % 9;
	}

	if(d10 != 1) {
		d1 = (year * sec + msec) % 9 +1;
	} else {
		d1 = (sec * msec) % 9;
	}


//	a = a10.toString() + a1.toString();
//	b = b10.toString() + b1.toString();
//	c = c10.toString() + c1.toString();
//	d = d10.toString() + d1.toString();

	a = a10 + a1;
	b = b10 + b1;
	c = c10 + c1;
	d = d10 + d1;


	image_render.img_a = 'images/top_img/a_'+a+'.jpg';
	image_render.img_b = 'images/top_img/b_'+b+'.jpg';
	image_render.img_c = 'images/top_img/c_'+c+'.jpg';
	image_render.img_d = 'images/top_img/d_'+d+'.jpg';

	image_render.timer_a = setTimeout(image_render.set_a, image_render.time_a);
	image_render.timer_b = setTimeout(image_render.set_b, image_render.time_b);
	image_render.timer_c = setTimeout(image_render.set_c, image_render.time_c);
	image_render.timer_d = setTimeout(image_render.set_d, image_render.time_d);


//	document.getElementById('img_a').src = image_render.img_a;
//	document.getElementById('img_b').src = image_render.img_b;
//	document.getElementById('img_c').src = image_render.img_c;
//	document.getElementById('img_d').src = image_render.img_d;

//	document.write('	<div><a href="japanese/index.html"><img src="images/top_img/a_'+a+'.jpg" alt="" /><img src="images/top_img/b_'+b+'.jpg" alt="" /><img src="images/top_img/c_'+c+'.jpg" alt="" /><img src="images/top_img/d_'+d+'.jpg" alt="" /></a></div>');

	},


	set_a: function() {
		document.getElementById('img_a').src = image_render.img_a;
	},
	set_b: function() {
		document.getElementById('img_b').src = image_render.img_b;
	},
	set_c: function() {
		document.getElementById('img_c').src = image_render.img_c;
	},
	set_d: function() {
		document.getElementById('img_d').src = image_render.img_d;
	}

};