Sibling + selector does't work in IE7 when using jQuery

Question

Trying to select a sibling element using jQuery and it doesn\'t work in IE7.

Here is my sample code: http://jsfiddle.net/y7AHz/6/ (click Run to see result)

Answer 1

This will also work in IE7:

var foo= $("#txtInput + ul.ulContainer");
var numberOfListItems = $('li', foo).length;

 $("#output").text(numberOfListItems);

Not sure which of the proposed fixes performs best, if it matters...