headerBannerUrls = new Array();
headerBannerOdds = new Array ();
sideBannerUrls = new Array();
sideBannerOdds = new Array ();

var bannerDir = '/show/2007/public/bnr_2007';
var headerBannerId = 'headerBanner';
var sideBannerId = 'sideBanner';

var initHeaderBanner = function() {
	headerBannerUrls[0] = 'headerbnr.html';
	
	headerBannerOdds[0] = 100;
}

var initSideBanner = function() {
	sideBannerUrls[0] = 'sidebnr_sce_j.html';
	sideBannerUrls[1] = 'sidebnr_unt_j.html';
	sideBannerUrls[2] = 'sidebnr_nipponkoa_j.html';
	sideBannerUrls[3] = 'sidebnr_morimoto_j.html';
	
	
	sideBannerOdds[0] = 31;
	sideBannerOdds[1] = 31;
	sideBannerOdds[2] = 25;
	sideBannerOdds[3] = 13;
}

var initBanner = function() {
	initHeaderBanner();
	initSideBanner();

	pickUpHeaderBanner();
	pickUpSideBanner();
}

var pickUpHeaderBanner = function() {
	var r = Math.random() * 100;
	var n = 0;
	for(i = 0; i < headerBannerOdds.length; i++){
		n += headerBannerOdds[i]; 
		if(r < n){
			$(headerBannerId).src = bannerDir + '/' + headerBannerUrls[i];
			break;
		}
	}
}

var pickUpSideBanner = function() {
	var r = Math.random() * 100;
	var n = 0;
	for(i = 0; i < sideBannerOdds.length; i++){
		n += sideBannerOdds[i]; 
		if(r < n){
			$(sideBannerId).src = bannerDir + '/' + sideBannerUrls[i];
			break;
		}
	}
}

Event.observe(window, 'load', initBanner, false);