var currentPage = 1;

function showNextPage() {
	var nextPage = currentPage+1;
	if (null == document.getElementById('boxpage'+nextPage)) {
		nextPage = 1;
	}
	if (currentPage == nextPage)
		return;
	if (null != document.getElementById('boxpage'+currentPage)) {
		document.getElementById('boxpage'+currentPage).style.display = 'none';
	}
	if (null != document.getElementById('boxpage'+nextPage)) {
		document.getElementById('boxpage'+nextPage).style.display = '';
	}
	currentPage = nextPage;
}

function showPrevPage() {
	var prevPage = currentPage-1;
	if (null == document.getElementById('boxpage'+prevPage)) {
		prevPage = currentPage;
		while (null != document.getElementById('boxpage'+prevPage)) {
			prevPage++;
		}
		prevPage--;
	}
	if (currentPage == prevPage)
		return;
	if (null != document.getElementById('boxpage'+currentPage)) {
		document.getElementById('boxpage'+currentPage).style.display = 'none';
	}
	if (null != document.getElementById('boxpage'+prevPage)) {
		document.getElementById('boxpage'+prevPage).style.display = '';
	}
	currentPage = prevPage;
}

function showNoExpertSelected() {
	document.getElementById('error_no_expert_selected').style.display = '';
}