function toggleVisibility(sectionId, source)
{
	var control = document.getElementById(sectionId);

	// need to collapse
	if (source.className.indexOf('_Expanded') >= 0)
	{
		source.className = source.className.replace('_Expanded', '_Collapsed');
		control.style.display = "none";
	}
	else
	{
		source.className = source.className.replace('_Collapsed', '_Expanded');
		control.style.display = "block";
	}
}