In an event handler bound to the "tabsselect" event, the 'ui' parameter is undefined.

To reproduce: Given the example code provided in the UI/Tabs documentation ( http://docs.jquery.com/UI/Tabs#Events), bind an event handler to "tabsselect", e.g.

<script> $(document).ready(function(){

var tablist = $("#example > ul").tabs(); tablist.bind("tabsselect", function(evt, ui) {

alert("tab: "+ui.tab);

});

}); </script>

The attempt to access ui.tab will produce an error, because ui is undefined.