// Some DOM modifications for splitting certain lists into two,
// to get two-columned lists more easily
// by Lost Boys - www.lostboys.nl

SplittedLists = function(root) {	
	var els = getElementsByAttributeValue("class", "splitted", root);
	for(var i = 0; i < els.length; i++) {
		if(els[i].tagName.toLowerCase() == "ul" || els[i].tagName.toLowerCase() == "ol") this.splitList(els[i]);
	}
}

SplittedLists.prototype.splitList = function(list) {	
	/* create two sets, put them in place of the original list, including classnames (but not 'splitted') */
	var set1 = document.createElement(list.tagName.toLowerCase());
	var set2 = document.createElement(list.tagName.toLowerCase());
	ClassName.remove(list, "splitted");
	set1.className = set2.className = list.className;
	list.parentNode.replaceChild(set2, list);
	set2.parentNode.insertBefore(set1, set2);
	/* devide the list items over the set */
	var items = list.getElementsByTagName("li");
	var half = Math.round(items.length / 2);
	if(list.tagName.toLowerCase() == "ol") set2.start = half + 1;
	if(items.length == 1) set2.parentNode.removeChild(set2);
	for(var j = items.length - 1; j > half - 1; j--) {
		set2.insertBefore(items[j], set2.firstChild);
	}
	for(var j = half - 1; j >= 0; j--) {
		set1.insertBefore(items[j], set1.firstChild);	
	}
}

EventListener.addEvent(window, "load", function() {
	window.splittedLists = new SplittedLists();
} );