Open Bravo ERP

I am an absolute Novice on open source but have a want to get involved. I have downloaded Open Bravo as well as the Java that was needed and now it wants Ant, I have downloaded a few types of Ant but cannot seem to be able to load any of them, Please help How do I load Ant, or rather please send me infor on how to load Open Bravo ERP.
Fanx…..