function revealContent() { 
	// shows the main page content after a small delay.
	clearTimeout(timerID); 
	$('content').fade(0.85); 
	}

function showTab(aTab) {
	if (aTab != currentTab) {
		var newEl = $('page_' + aTab);
		var curEl = $('page_' + currentTab);
		currentTab = aTab;

		curEl.setStyle('display', 'none');
		newEl.setStyle('display', 'block');
		}
	}