This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
If you would post what you have so far, and where you are running into problems, we would be happy to help. (The Ant documentation contains the example you want - look under the heading "Using Apache Ant".)