function doContent(makeVisible) {
	document.getElementById("chapter02").className="hide";
	document.getElementById("chapter03").className="hide";
	document.getElementById("chapter04").className="hide";
	document.getElementById("chapter05").className="hide";
	document.getElementById("chapter06").className="hide";
	document.getElementById("chapter07").className="hide";
	document.getElementById("chapter08").className="hide";
	document.getElementById("chapter09").className="hide";
	document.getElementById("chapter10").className="hide";
	document.getElementById("chapter11").className="hide";
	document.getElementById("chapter12").className="hide";
	document.getElementById("chapter13").className="hide";
	document.getElementById("chapter14").className="hide";
	document.getElementById(makeVisible).className="show";
	return false;
}