img = new Array();
img[0] = "images/top/img_pattern6.jpg";
img[1] = "images/top/img_pattern7.jpg";
img[2] = "images/top/img_pattern8.jpg";
img[3] = "images/top/img_pattern9.jpg";

function topimg(){
	amount = img.length;
	No = Math.floor(Math.random()*amount);
	document.write("<img src='" + img[No] + "' border='0'>");
}