var length = 0;
var current = 0;
var next = 0;

function setLength(number)
{
	length = number;
}

function navigateNews( direction )
{
	var currentNews;
	var nextNews;
	
	if( direction == 'next' )
	{
		next++;
		next = ( next % length );
	}
	else
	{
		next--;
		if( next < 0 ) next = ( length - 1 );
	}
	
	currentNews = document.getElementById( "news" + current );
	nextNews = document.getElementById( "news" + next );
	
	currentNews.style.display = "none";
	nextNews.style.display = "block";
	
	current = next;
}