var oldLink;
var oldContinent;

function showContinent( link, continent ) {
	if( oldLink ) {
		oldLink.className = "";
	}
	if( oldContinent ) {
		oldContinent.style.display = 'none';
	}
	
	oldLink = link;
	oldLink.className = "selected";
	oldContinent = document.getElementById( continent );
	if( oldContinent ) {
		oldContinent.style.display = "block";
		return false; // no link
	}
	
	return true; // direct link
}