bannerArray=new Array();
urlArray=new Array();

// banner ads into array
bannerArray.push('xtreme-van-banner-ad.jpg');
bannerArray.push('banner_ecogreen.jpg');
bannerArray.push('banner_indecor.jpg');
bannerArray.push('banner_gauthier.jpg');

// links for banner ads into array
urlArray.push('#');
urlArray.push('#');
urlArray.push('#');
urlArray.push('#');

//set initial ad to display using random number
var adCount=bannerArray.length;
var currentAdNum=Math.floor(Math.random()*adCount);
document.getElementById('bannerAdAnchor').href=urlArray[currentAdNum];
document.getElementById('bannerAd').src='ads/'+bannerArray[currentAdNum];

//rotate ads on timer
setInterval('updateBanner()', 12000);
//function to advance ad
function updateBanner(bDirection){
	if(bDirection != 'back'){
		currentAdNum++;
	}
	else currentAdNum--;
	if(currentAdNum > (adCount-1))currentAdNum=0;
	if(currentAdNum < 0)currentAdNum=adCount-1;
	document.getElementById('bannerAdAnchor').href=urlArray[currentAdNum];
	document.getElementById('bannerAd').src='ads/'+bannerArray[currentAdNum];
}