var current_active_tab = 1;

function activate_tab(tab){
	this.blur();

	$('tab-section').className = 'section-' + tab;

	if ($('tabcontents' + current_active_tab)){
		$('tabcontents' + current_active_tab).style.visibility = 'hidden';
		$('tabcontents' + current_active_tab).style.display = 'none';
	}
	$('tabcontents' + tab).style.visibility = 'visible';
	$('tabcontents' + tab).style.display = 'block';

	current_active_tab = tab;
}