function openChapter(sectionNum) {
	if (!oldObject) oldObject = document.getElementById('s00Index');
	oldObject.style.display = 'none';
	if (oldObjectHi) oldObjectHi.className = 'sectionDim';
	if (sectionNum <= 9) sectionNum = '0' + sectionNum;
	chHi = 's' + sectionNum;
	turnTo = 's' + sectionNum + 'Index';
	objectHi = document.getElementById(chHi);
	object = document.getElementById(turnTo);
	objectHi.className = 'sectionHi';
	object.style.display = 'block';
	oldObject=object;
	oldObjectHi=objectHi;
}