Tabs: Made detection of navigation more flexible - now the first desc…

…endant list (ul or ol) found will be used instead of forcing it to be the first child ul.

Fixes #4501 - Tabs should work with ordered lists (<ol>) in addition to unordered (<ul>)
Fixes #4506 - tabs(): allow more flexibility in specifying what list is used

ui/jquery.ui.tabs.js

@@ -73,7 +73,8 @@ $.widget("ui.tabs", {
 
 	_tabify: function(init) {
 
-		this.list = this.element.children('ul:first');
+		// use $('li:first').parent() so we can find the first ul/ol in DOM order
+		this.list = this.element.find('li:first').parent();
 		this.lis = $('li:has(a[href])', this.list);
 		this.anchors = this.lis.map(function() { return $('a', this)[0]; });
 		this.panels = $([]);