(function() {
    var imgLength = 3;
	var date = new Date();
	var hour = date.getHours();
	var img = Math.ceil(Math.random()*imgLength);

	if(hour>17 || hour<6){
		document.write("<img src='/images/head_img_night0" + img + ".jpg' alt='上質と、暮らす。みなとみらいに、暮らす。' width='980' height='318' />");
	}else{
		document.write("<img src='/images/head_img_day0" + img + ".jpg' alt='上質と、暮らす。みなとみらいに、暮らす。' width='980' height='318' />");
	}
})();