img = new Array();
img[0] = "http://202.229.236.91/jp/waterplanet/images/watertop_L2.jpg";
img[1] = "http://202.229.236.91/jp/waterplanet/images/watertop_L3.jpg";
img[2] = "http://202.229.236.91/jp/waterplanet/images/watertop_L4.jpg";
img[3] = "http://202.229.236.91/jp/waterplanet/images/watertop_L5.jpg";
img[4] = "http://202.229.236.91/jp/waterplanet/images/watertop_L6.jpg";

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