var bannerCount = 0;
var atBanner = 0;

function bannerChange () {
	var newBanner;
	
	if (document.getElementById ("banner"+(atBanner+1)) == null) {
		return;
	}
	
	document.getElementById ("banner"+(atBanner+1)).style.display = "none";
	newBanner = atBanner;
	
	if (bannerCount > 1) {
		while (newBanner == atBanner) {
			newBanner = parseInt(Math.random ()*bannerCount);
		}
	}
	atBanner = newBanner;
	document.getElementById ("banner"+(atBanner+1)).style.display = "block";
	t = setTimeout ("bannerChange()", 6000);
}

function bannerStart () {	
	var banner;	
	
	while (banner = document.getElementById ("banner"+(bannerCount+1)) != null) {
		bannerCount++;
	}
	
	t = setTimeout ("bannerChange()", 6000);
}