function tabsShow(num) {
	for (var i = 1; i <= 2; i++) {
		document.getElementById('tab-'+i).className = '';
		document.getElementById('content-'+i).className = 'hidden';
	}
	
	var tab = document.getElementById('tab-'+num);
	var content = document.getElementById('content-'+num);
	tab.className = 'active';
	content.className = 'visible';
}