// JavaScript Document

var ads = new Array();
ads[ads.length] = '<img src="http://www.grive.biz/img/item/main_image/top01.jpg" alt="ホームページ制作をお考えなら grive【グライブ】" />';

ads[ads.length] = '<img src="http://www.grive.biz/img/item/main_image/top02.jpg" alt="ホームページ制作をお考えなら grive【グライブ】" />';

function write_ad() {shuffle(ads);
for (var i = 0; i < 1; i++) {
	document.write(ads[i], "<br>");
}
}
function shuffle(array) {
	for (var i = array.length; --i; ) {
		var r = Math.floor(Math.random() * (i+1));
		if (r != i) {
			var tmp = array[i];
			array[i] = array[r];
			array[r] = tmp;
			}
 }
}