Goto Repository Browser of your repository, right-click on the parent folder where your deleted folder existed. Now, Show Log of the parent folder, and select the previous revision where you committed the delete operation. You'll have a list and right click on the folder from the revision info and select Update to this Revision.
Just copy the deleted folder back from an earlier revision.
In the Repository Browser, click the button labeled HEAD (at the top-right corner) to show to a revision there your folder still exists, then right-click that folder and select "Copy to..." and enter the path there you want the folder to be re-created (probably the same path that is already in the text box).