/**
* This code does two things:
* 1. numbers the sections (i.e. puts a number in front of the content of the elements h1, h2, ..., h6)
* 2. generates a table of contents into an element with an ID "toc"
*
* @author Kaarel Kaljurand
* @version 2008-03-12
*
* Changelog:
*
* 2008-03-12: TOC now contains links to section headings
* 2007-01-17: Minor fixes and comments changed into English
* 2006-07-07: TOC support added
* 2002-07-09: First version
*/

function toc(firstNumber, makeToc) {
	var tased = new Array("H2", "H3", "H4", "H5", "H6");
	var pead = new Array(5);

	pead[0] = firstNumber - 1;
	pead[1] = pead[2] = pead[3] = pead[4] = 0;

	tased["H2"] = 0;
	tased["H3"] = 1;
	tased["H4"] = 2;
	tased["H5"] = 3;
	tased["H6"] = 4;

	if (makeToc) {
		var tocHolder = document.getElementById("toc");

		if(tocHolder == null) {
			alert("error: element with id='toc' not found");
		}
	}

	// we start the search from "body"
	var somebody = document.getElementsByTagName("body").item(0);
	if(somebody == null) {
		alert("error: nobody found");
	}
	else {
		var tocContent = "";
		// we only consider the direct childern of "body"
		for(var i = 0; i < somebody.childNodes.length; i++) {

			//this doesn't work in Mozillaga???: var t = somebody.childNodes[i].tagName;
			var t = somebody.childNodes[i].nodeName;

			// BUG: just in case browsers differ (at least they used to in 2002)
			var s = t.toUpperCase();

			if(s == "H2" || s == "H3" || s == "H4" || s == "H5" || s == "H6") {
				tase = tased[s];
				pead[tase]++; // increase the counter

				// set all the next levels to zero
				for(j = tase + 1; j < pead.length; j++) {
					pead[j] = 0;
				}

				// create a string
				number = pead[0];

				for(j = 1; (pead[j] != 0) && (j < pead.length); j++) {
					number += "." + pead[j];
				}
				number += " ";

				// We use "\r\n" to make IE happy.
				if (makeToc) {
					var tocEntry = somebody.childNodes[i].firstChild.nodeValue;
					tocContent += number + " " + "<a href='#" + tocEntry + "'>" + tocEntry + "</a>\r\n";
				}

				var title = somebody.childNodes[i].innerHTML;
				somebody.childNodes[i].innerHTML = number + "<a name='" + title + "'>" + title + "</a>";
			}
		}
		if (makeToc) {
			tocHolder.innerHTML = tocContent;
		}
	}
}