var alert_level = 0;

var js_version=1.0;
var js_version=1.1;
var js_version=1.2;
var js_version=1.3;
var alt_index = 0, src_index = 1, url_index = 2, site_area_index = 3, size_index = 4;

var banners = new Array(
<!-- #bbinclude "banner_export.txt" -->
 ['Finlandia Start Banner', '../banners/banner_start.gif', 'http://www.finlandiavodka.com/finlandia/f1game99/index.html', '', '468x60'],
 ['Sunderland Banner', '../banners/banner_sunderland_1.gif', 'http://www.sunderlandgolf.com/', 'news club equip', '468x60'],
 ['ECS Travel Banner', '../banners/banner_ecs_1.gif', 'http://www.ecs-travel.com/', 'news travel equip', '468x60'],
 ['Brend Hotels Banner', '../banners/banner_brend_1.gif', 'http://www.brend-hotels.co.uk', 'club news accom', '468x60'],
 ['Farleigh Court Banner', '../banners/banner_fcg_1.gif', 'http://www.fcg-int.com', 'news club accom equip', '468x60'],
 ['Golfer\'s Club Banner', '../banners/banner_golfersclub_1.jpg', 'http://www.whatgolf.com/~pinhigh/', 'news club accom equip', '468x60'],
 ['Prince of Wales Banner', '../banners/banner_princeofwales.gif', 'http://www.whatgolf.com/princeofwales/', 'news accom', '468x60'],
 ['Faldo 10x10 Banner', '../banners/banner_faldo_10x10.gif', 'http://www.whatgolf.com/golfinternational/faldo_10x00.html', 'gi', '468x60'],
 ['Sunderland Mini', '../banners/mini_sunderland_2.gif', 'http://www.sunderlandgolf.com/', 'news equip', '130x60'],
 ['Sky Sports News Mini', '../banners/mini_skysportsnews.gif', 'http://www.skysports.co.uk/skysports/golf/', 'news equip', '130x60'],
 ['Golf Reservations Mini', '../banners/mini_golfreservations.gif', 'http://www.golf-reservations.co.uk', 'news equip club', '130x60'],
 ['Prince of Wales Square', '../banners/sq_princeofwales.gif', 'http://www.whatgolf.com/princeofwales/', 'news club', '130x130'],
 ['Gleneagles Square', '../banners/sq_gleneagles.gif', 'http://www.gleneagles.com', 'news club', '130x130']);
<!-- end bbinclude -->

function showBanner(src, site_area, size) {
	if (alert_level > 1) {alert('Entering showBanner ' + src + ' ' + site_area + ' ' + size)};
	banner_choice = matchCriteria(src, site_area, size);
	if (banner_choice != -1) {
		if (alert_level > 0) {alert('The final banner_choice:' + banner_choice + '\n' + banners[banner_choice][src_index])};
		chosen_banner = banners[banner_choice];
		b_alt           = chosen_banner[alt_index];
		b_src           = chosen_banner[src_index];
		b_url           = chosen_banner[url_index];
		b_size          = chosen_banner[size_index];
		b_width         = b_size.substring(0,b_size.indexOf("x"));
		b_height        = b_size.substring(b_size.indexOf("x") + 1,b_size.length);

		b_tag = '<a href="' + b_url + 
			'"><img alt="' + b_alt + 
			'" src="' + b_src + 
			'" width="' + b_width + 
			'" height="' + b_height + '" align="left" border="0" hspace="0" target="_top"><\/a>';
		//alert(b_tag);
		banners[banner_choice] = ['','','','','']; // blank out banner entry, so cannot be reused
		document.write(b_tag);

	} else {
		if (alert_level > 0) {alert('No banner matches any criteria')}
	}
}

//-- Generate a random number between 0 and max.
function randomNum(max) {
	if (alert_level > 1) {alert('Entering randomNum')};
	if (js_version > 1) {
		random_choice = Math.floor(Math.random()*(max));
	} else {
		random_choice = 0;
	}
	if (alert_level > 1) {alert('Random in:' + max + ' out:' + random_choice)};
	return random_choice;
}

function matchCriteria(src, site_area, size) {
	var possibles = new Array();
	if (alert_level > 1) {alert('Entering matchCriteria ' + src + ' ' + site_area + ' ' + size)}
	for (i=0;i<banners.length;i++) {

		var src_match  = src       != '' && banners[i][src_index].indexOf(src) != -1;
		var site_match = site_area != '' && banners[i][site_area_index].indexOf(site_area) != -1;
		var size_match = size      != '' && banners[i][size_index].indexOf(size) != -1;
		
		if (src_match && (size_match || size == '')) {
			if (alert_level > 2) {alert('Found a possible on src ' + i)}; 
			possibles[possibles.length] = i;
		} else {
			if (src == '' && size_match && (site_match || site_area == '')) {
				if (alert_level > 2) {alert('Found a possible on site/size ' + i)};
				possibles[possibles.length] = i;
			}
		}
	}
	
	if (alert_level > 1) {alert('There are ' + possibles.length + ' possibles.')};
	
	if (possibles.length == 0) {
		if (alert_level > 1) {alert('No possibles')};
		if (src != '' && site_area != "") { // src specified but not found, site_area also specified
			matchCriteria('',site_area,size); // try just the site_area
		} else { 
			if (site_area != '') { // no src specified, didn't find a match for the site_area
				matchCriteria('','',size); // try again with just size
			} else {
				banner_choice = -1; // no banner matches specified size!
			}	
		}
	}
		
	if (possibles.length == 1) {
		if (alert_level > 1) {alert('One possible')};
		banner_choice = possibles[0];
	}
	
	if (possibles.length > 1) {
		if (alert_level > 1) {alert('Several possibles')};
		banner_choice = possibles[randomNum(possibles.length)];
		if (alert_level > 1) {alert ('The banner chosen is no.: ' + banner_choice)};
	};
	// blank all fields in chosen banner. banners[i][site_areas_index] = "";
	return banner_choice;
}

//for (j=0;j<=10;j++) {
//showBanner('','','468x60');
//}