function getRandom() {
	var tal;
	tal = 6*Math.random();
	tal = Math.ceil(tal);
	return tal;
}

html = "";

html += "<table cellpadding=\"2\" cellspacing=\"2\" border=\"0\"><tr><td><a href=\"#top\">To top of page</a></td><td><img src=\"images/small_butterfly"+getRandom()+".jpg\" width=\"31\" height=\"31\" alt=\"\" border=\"0\"></a></td></tr></table>";

document.write(html);