function swapHeader(id)
{
	id     = id == null
		? 'default'
		: id;
	
	var obj      = document.getElementById('header:' + id);
	var parent   = obj.parentNode;
	var children = parent.childNodes;
	
	for(var i = 0; i < children.length; i++)
	{
		var child = children[i];
		
		if(child.nodeName == 'DIV')
		{
			child.style.display = 'none';
		}
	}
	
	obj.style.display = 'block';
}