$(document).ready(function(){
	var emptyli = '<li class="empty">&nbsp;</li>';
	$('#sidebar ul').append(emptyli).prepend(emptyli);
	
	if($('#sidebar ul li').length <= 8){
		$('#scrollUp, #scrollDown').hide();
	}else{
		buildNavigation();	
	} 
});

function buildNavigation(){
	var currentNav = 7
	$('#scrollUp').click(function(){//Hide from below
		if(currentNav == 7) return false;
		$('#sidebar ul li').eq(currentNav-8).show();
		currentNav--;
	});
	
	$('#scrollDown').click(function(){ //Hide from top
		if($('#sidebar ul li:visible').length <= 8) return false;
		$('#sidebar ul li').eq(currentNav-7).hide();
		currentNav++;
	});
}