openSectionID = null;
function gotoSection(sID) {
	if(openSectionID != null)
		closeSection(openSectionID);
	document.getElementById(sID).className = "visibleCG";
	openSectionID = sID;
	return true;
}

function closeSection(sID) {
	document.getElementById(sID).className = "hiddenCG";
	if(openSectionID == sID)
		openSectionID = null;
	return true;
}