var images = new Array();

/* 使用するタイトル画像を好きなだけ記述 */
/*images[0] = "http://blog-imgs-27.fc2.com/b/l/o/blog931/title0.jpg";*/
images[0] = "http://blog-imgs-27.fc2.com/b/l/o/blog931/title1.gif";
images[1] = "http://blog-imgs-27.fc2.com/b/l/o/blog931/title2.gif";

var rnd = Math.floor((Math.random() * 100)) % images.length;
document.write('<img src=',images[rnd],' border="0">');