<dl class="tabbed">
<dt>Foo</dt>
<dd>Content for Foo</dd>
<dt>Bar</ct>
<dd>Content for Bar</dd>
</dl>

function tabbedprefs() { // nename in maketabs() ?
        if (!wgNamespaceNumber) return; // in on mainspace return (or not ?)
	var prefform = document.getElementById('tabbed');
	if (!prefform || !document.createElement) {
		return;
	}
	if (prefform.nodeName.toLowerCase() == 'a') {
		return; // Occasional IE problem
	}
	prefform.className = prefform.className + 'jsprefs';
	var sections = [];
	var childrenTitles = prefform.childNodes.getElementsByTagName('dt');
        var childrenContent = prefform.childNodes.getElementsByTagName('dd');
        if (childrenTitles.length != childrenContent.length) return; //if there is not the same number on dt and dd
	var seci = 0;
	for (var i = 0; i < childrenTitles.length; i++) {
		if (childrenTitles[i].nodeName.toLowerCase() == 'dt') { // == 'fieldset';
			childrenTitles[i].id = 'prefsection-' + seci;
			childrenTitles[i].className = 'prefsection';
			if (is_opera || is_khtml) {
				childrenTitles[i].className = 'prefsection operaprefsection';
			}
			var legends = childrenTitles[i].nodeValue; //.getElementsByTagName('legend');
			sections[seci] = {};
			legends[0].className = 'mainLegend';
			if (legends[0] && legends[0].firstChild.nodeValue) {
				sections[seci].text = childrenContent[i].firstChild.nodeValue; //not sure of [i] or [seci]
			} else {
				sections[seci].text = '# ' + seci;
			}
			sections[seci].secid = childrenContent[i].id;
			seci++;
			if (sections.length != 1) {
				childrenContent[i].style.display = 'none';
			} else {
				var selectedid = childrenContent[i].id;
			}
		}
	}
	var toc = document.createElement('ul');
	toc.id = 'preftoc';
	toc.selectedid = selectedid;
	for (i = 0; i < sections.length; i++) {
		var li = document.createElement('li');
		if (i === 0) {
			li.className = 'selected';
		}
		var a = document.createElement('a');
		a.href = '#' + sections[i].secid;
		a.onmousedown = a.onclick = uncoversection;
		a.appendChild(document.createTextNode(sections[i].text));
		a.secid = sections[i].secid;
		li.appendChild(a);
		toc.appendChild(li);
	}
	prefform.parentNode.insertBefore(toc, prefform.parentNode.childNodes[0]);
	document.getElementById('prefsubmit').id = 'prefcontrol';
}