img = new Array();
img[0] = "img/top_main01.jpg";
img[1] = "img/top_main02.jpg";
img[2] = "img/top_main03.jpg";
img[3] = "img/top_main04.jpg";
img[4] = "img/top_main06.jpg";
img[5] = "img/top_main07.jpg";
img[6] = "img/top_main08.jpg";

function setRandom(){
	amount = img.length;
	num = Math.floor(Math.random()*amount);
	document.write("<img src='" + img[num] + "' alt='' border='0'>");
}