var NumTopPic = 5;

function PickTopPic(range) 
{	
	var imageNum, name='images/Ads2/';
	imageNum = 1 + Math.round (Math.random() * (range-1));	
  	if(imageNum == 1) name += 'Ad1';
	else if(imageNum == 2) name += 'Ad2';
	else if(imageNum == 3) name += 'Ad3';
	else if(imageNum == 4) name += 'Ad4';
	else name += 'Ad5';
	name += '.gif'
  	return name;
}

var TopPicChoice2 = PickTopPic(NumTopPic);