var page=1;
function nextPage(){
	switch(page){
		
		case 1:
		page++;
		document.getElementById("appleTab1").className="hidden";
		break;
		
		case 2:
		page++;
		document.getElementById("appleTab2").className="hidden";
		break;
		
		case 3:
		page++;
		document.getElementById("appleTab3").className="hidden";
		break;
		
		case 4:
		page = 1;
		document.getElementById("appleTab4").className="hidden";
		break;
	}
	document.getElementById("appleTab"+page).className="none";
	document.getElementById("pageNum").innerHTML = "("+page+"/4)";
}

function prevPage(){
	switch(page){
		case 1:
		page = 4;
		document.getElementById("appleTab1").className="hidden";
		break;
		
		case 2:
		--page;
		document.getElementById("appleTab2").className="hidden";
		break;
		
		case 3:
		--page;
		document.getElementById("appleTab3").className="hidden";
		break;
		
		case 4:
		--page;
		document.getElementById("appleTab4").className="hidden";
		break;
	}
	document.getElementById("appleTab"+page).className="none";
	document.getElementById("pageNum").innerHTML = "("+page+"/4)";
}