$(this).closest('.report').next();
since the list is the next sibling. If you want to get the previous sibling, you would use .prev
.
More info: http://api.jquery.com/next/, http://api.jquery.com/prev/.
Here is a list of all traversal methods.
Since you bound the event handler to the .report
element anyway, you can also make use of event.delegateTarget
instead of $(this).closest(...)
:
$(event.delegateTarget).next();