window.onload = showBanner;


function showBanner() {
// set bannerCount to the number of banners
	var bannerCount = 6;
	var bannerNo = Math.floor((Math.random() * bannerCount))+1;
//	document.getElementById("testtxt").innerHTML = bannerNo;
	var thisPic = "images/banner"+bannerNo+".jpg";
	document.getElementById("myBanner").src = thisPic;
}