var img=new Array("http://www.jurer.jp/wp-content/themes/jurer/images/mimg_01.jpg","http://www.jurer.jp/wp-content/themes/jurer/images/mimg_02.jpg","http://www.jurer.jp/wp-content/themes/jurer/images/mimg_03.jpg","http://www.jurer.jp/wp-content/themes/jurer/images/mimg_04.jpg");
document.write('<img src="'+img[Math.floor(Math.random()*img.length)]+'" width="890" height="446" border="0" />');