var rootdirectory = 'stage/';
var rootdirectory2 = 'ach/';

var about_banners = Array('banner_01.gif', 'banner_02.gif', 'banner_03.gif');
var news_events_banners = Array('banner_01.gif', 'banner_02.gif', 'banner_03.gif');
var programs_research_banners = Array('banner_01.gif', 'banner_02.gif', 'banner_03.gif', 'banner_03.gif');
var help_banners = Array('banner_01.gif', 'banner_02.gif', 'banner_03.gif');
var careers_banners = Array('banner_01.gif', 'banner_02.gif', 'banner_03.gif');
var contact_banners = Array('banner_01.gif', 'banner_02.gif', 'banner_03.gif');
var pff_banners = Array('banner_01.gif', 'banner_02.gif', 'banner_03.gif');
var children_banners = Array('banner_01.gif', 'banner_02.gif', 'banner_03.gif');
var surgery_banners = Array('banner_01.gif', 'banner_02.gif');

function i_getRelativePath() {
	var pathname = location.pathname.substring(1).replace(rootdirectory, '').toLowerCase().replace(rootdirectory2, '');
	var dir = '';
	for(var i=0; i<pathname.length; i++) {
		if(pathname.charAt(i) == '/') {
			dir += '../'
		}
	}
	return dir;
}

function i_getSection() {
	var pathname = location.pathname.substring(1).replace(rootdirectory, '').toLowerCase().replace(rootdirectory2, '');
	var section = "";
	if(pathname.indexOf('/') > 0) {
		section = pathname.substring(0, pathname.indexOf('/'));
	}
	return section;
}

function i_banners(imagefolder, section) {
	this.imagefolder = imagefolder;
	this.section = section;
	this.banners = Array();
	
	this.loadBanners = i_loadBanners;
	this.getRandomNumber = i_getRandomNumber;
	this.displayBanner = i_displayBanner;
}

function i_loadBanners(banners) {
	this.banners = banners;
}

function i_getRandomNumber() {
	var day = new Date();
	var seed = day.getTime();
	return parseInt(((seed - (parseInt(seed/1000,10) * 1000)) /10) /100 * randombanner.banners.length + 1,10);
}

function i_displayBanner() {
	var randomnumber = this.getRandomNumber();
	var relativepath = i_getRelativePath();
	document.write('<img src="' + relativepath + this.imagefolder + '/' + this.section + '/' + this.banners[randomnumber-1] + '">');
}

var imagefolder = 'images/layout';
var section = i_getSection();
var randombanner = new i_banners(imagefolder, section);

switch(section) {
	case 'about':
	randombanner.loadBanners(about_banners);
	break;
	
	case 'news_events':
	randombanner.loadBanners(news_events_banners);
	break;
	
	case 'programs_research':
	randombanner.loadBanners(programs_research_banners);
	break;
	
	case 'help':
	randombanner.loadBanners(help_banners);
	break;
	
	case 'careers':
	randombanner.loadBanners(careers_banners);
	break;
	
	case 'contact':
	randombanner.loadBanners(contact_banners);
	break;
	
	case 'pff':
	randombanner.loadBanners(pff_banners);
	break;
	
	case 'children':
	randombanner.loadBanners(children_banners);
	break;
	
	case 'surgery':
	randombanner.loadBanners(surgery_banners);
	break;
	
	default:
	randombanner.loadBanners(contact_banners);
	break;
}

randombanner.displayBanner();