function rotateBanners() 
		{
			var counter = 12;
			var eff = 'appear';
			var dur = 1;
			var inter = 2;
			
			//show first (last numerically) picture as page loads
			Effect.toggle('rotate' + counter, eff, { duration: 0 });
			
			var count = counter - 1;
			var tohide = counter;
			
			setInterval(function() {
				//fades out last picture - fades in next
				Effect.toggle('rotate' + tohide, eff, { duration: dur });
				Effect.toggle('rotate' + count, eff, { duration: dur });
				
				tohide = count;
				count = (count == 1)? counter : count - 1;
			},inter * 1000);
		}