function showTab(id, obj) {
	for (i=1;i<=4;i++) {
		e = document.getElementById('tab-' + i);
		e.style.visibility = 'hidden';
		e.style.display = 'none';		
		e = document.getElementById('href-' + i);
		e.style.color = '#4a8fd4';
	}

	e = document.getElementById('tab-' + id);
	e.style.visibility = 'visible';
	e.style.display = 'block';
	e = document.getElementById('href-' + id);
	e.style.color = '#ffffff';
}

function showAndHide(id_show, id_hide) {
	e = document.getElementById(id_hide);
	e.style.visibility = 'hidden';
	e.style.display = 'none';		

	e = document.getElementById(id_show);
	e.style.visibility = 'visible';
	e.style.display = 'block';
}