How to specify target namespace programmitcally at runtime for a jax-ws client proxy ?

Issue

• We need some guidance on how to programmatically set the target namespace at runtime for a jax-ws client proxy.
• We have situation where we need call a multiple SOAP web services, but the only difference between these web services is that the namespace is different there are lots of trading partners that are hosting it.
• Each web service has the same set of operations.
• Is it possible to stay plain vanilla jax-ws rather than resorting to some cxf specific stuff ? Any code examples on how to do would be greatly appreciated.