var NumberOfAds = 5
var ChosenAd = 0
var NumberOfAdsLeft = 0
var templayer
var LayerAd
function choosead(){
	 ChosenAd = Math.floor(NumberOfAds*Math.random()+1);
	 LayerAd = document.getElementById('Ad' + ChosenAd);
	 LayerAd.style.visibility = "visible";
	 LayerAd.style.left - 20;
	 LayerAd.style.top = 572
	 }
	
function chooseadmain(){
	 ChosenAd = Math.floor(NumberOfAds*Math.random()+1);
	 LayerAd = document.getElementById('Ad' + ChosenAd);
	 LayerAd.style.visibility = "visible";
	 LayerAd.style.left - 20;
	 LayerAd.style.top = 465
	 }
/*function choosead(){
 	if (NumberOfAds > 1) {
	 ChosenAd = Math.floor(NumberOfAds*Math.random()+1);
	 LayerAd = document.getElementById('Ad' + ChosenAd);
	 LayerAd.style.visibility = "visible";
	 NumberOfAdsLeft = NumberOfAds
		 while (NumberOfAdsLeft != 0) {
			 if (NumberOfAdsLeft != ChosenAd)
			 templayer = document.getElementById('Ad' + NumberOfAdsLeft);
			 templayer.style.visibility = "hidden" ;
			 --NumberOfAdsLeft
			 }
		 }
	 else {
	LayerAd = document.getElementById['Ad1']
	LayerAd.style.visibility = "visible"	
	 }
}*/