function show(id) {
	obj = document.getElementById(id);
	obj.className = 'visible';
}
function hide(id) {
	obj = document.getElementById(id);
	obj.className = 'hidden';
}
function showTab(obj) {
	group = document.getElementById('tabs').getElementsByTagName('li');
	count = group.length-1;
	for(i=0; i<=count; i++) { group[i].className=''; }
	obj.className='active';
}