function rdmbanner() {
	var rndMax = 3;
	var rndNum = Math.floor(Math.random()*rndMax);
	var domUrl = document.getElementById("rdmUrl");
	var domImg = document.getElementById("rdmImg");

	// テキストを変更する月
	var changeMonth = 8;
	// テキストを変更する日
	var changeDay = 1;
	
	var day = new Date();
	var current_month = day.getMonth() + 1;
	var current_day = day.getDate();

	switch (rndNum) {
		case 0:
		if (current_month == changeMonth) {
			if (current_day >= changeDay) {
				// 変更日より後に表示する
				domUrl.href = "http://www.i-revo.jp/campaign/200608/";
				domImg.src = "/campaign/img/bnr500x100_camp_2006summer.jpg";
			} else {
				// 変更日より前に表示する
				domUrl.href = "http://www.i-revo.jp/campaign/mpfriend/";
				domImg.src = "/campaign/img/bnr_friend_camp.jpg";
			}
		} else if (current_month > changeMonth) {
			// 変更日より後に表示する
			domUrl.href = "http://www.i-revo.jp/campaign/200608/";
			domImg.src = "/campaign/img/bnr500x100_camp_2006summer.jpg";
		} else {
			// 変更日より前に表示する
			domUrl.href = "http://www.i-revo.jp/campaign/mpfriend/";
			domImg.src = "/campaign/img/bnr_friend_camp.jpg";
		}
		break;
		case 0:
		domUrl.href = "http://www.i-revo.jp/campaign/mpfriend/";
		domImg.src = "/campaign/img/bnr_friend_camp.jpg";
		break;
		case 1:
		domUrl.href = "http://www.i-revo.jp/campaign/200608/";
		domImg.src = "/campaign/img/bnr500x100_camp_2006summer.jpg";
		break;
		case 2:
		domUrl.href = "http://www.i-revo.jp/collaboration/mf247/";
		domImg.src = "/campaign/img/bnr_mf247.gif";
		break;
	}
}