var card = 1;
	
	function showCard(id) {
	   window.clearInterval(cardtimer);
	   swap('card' + card,'card' + id);
	   card = id;
	   setButton('card' + id);
	}
	
	function swapcard() {
	   var ele1 = 'card' + card;
	   card++;
	   if(card > cardCount) card = 1;
	   var ele2 = 'card' + card;
	   swap(ele1,ele2);
	   setButton(ele2);
	}
	
	function setButton(card) {
	   for(var y = 1; y <= cardCount; y++) {
	      var e = document.getElementById('card' + y + 'btn');
	      if('card' + y == card) {
	         e.style.background = '#149BD5';
	         e.style.color = '#fff';
	      } else {
	         e.style.background = '#efefef';
	         e.style.color = '#444';
	      }
	   }
	}
	
	setButton('card1');
	var cardtimer = window.setInterval(swapcard,'5000');