adImages = new Array("images/logo-green.gif","images/logo-blue.gif","images/logo-red.gif")
thisAd = 0
imgCt = adImages.length

function rotate() {
if (document.images){
thisAd++
if (thisAd == imgCt) {
thisAd = 0
}
document.adBanner.src=adImages[thisAd]
setTimeout("rotate()",3 * 1000)
}
}