function switchNewsTab(tab) {
	if (tab == 'news') {
		document.getElementById('newsTab').className = 'newsTabOn';
		document.getElementById('commentsTab').className = 'newsTabOff';
		document.getElementById('productNewsTab').className = 'newsTabOff';

		document.getElementById('news').style.display = 'inline';
		document.getElementById('comments').style.display = 'none';
		document.getElementById('productNews').style.display = 'none';		
	}
	if (tab == 'comments') {
		document.getElementById('newsTab').className = 'newsTabOff';
		document.getElementById('commentsTab').className = 'newsTabOn';
		document.getElementById('productNewsTab').className = 'newsTabOff';

		document.getElementById('news').style.display = 'none';
		document.getElementById('comments').style.display = 'inline';
		document.getElementById('productNews').style.display = 'none';	
	}
	if (tab == 'productNews') {
		document.getElementById('newsTab').className = 'newsTabOff';
		document.getElementById('commentsTab').className = 'newsTabOff';
		document.getElementById('productNewsTab').className = 'newsTabOn';
		
		document.getElementById('news').style.display = 'none';
		document.getElementById('comments').style.display = 'none';
		document.getElementById('productNews').style.display = 'inline';	
	}		
	return true;
}

function updateTabColour(tab) {
	if (document.getElementById(tab).style.display == 'none') {
		document.getElementById(tab + 'Tab').className = 'newsTabOff';	
	}
	return true;
}