[newbie] setting headers?

hello,

really green here...

I'm writing a client, and I need to set the Username and Password for this
header:

  <soap:Header>
    <wsSoapHeader xmlns="http://ecommerce.mysite.com/wsFoo">
      <Username>string</Username>
      <Password>string</Password>
    </wsSoapHeader>
  </soap:Header>

I think I'm supposed to create a Header(), and setHeader() on my Call
object?

The problem I'm having is calling setAttribute() on the header, which needs
a QName attribute and a String value.  I'm not sure which part is the
attribute and value...

help?
thanks,
jeff





CONFIDENTIAL NOTICE: This email including any attachments, contains 
confidential information belonging to the sender. It may also be 
privileged or otherwise protected by work product immunity or other 
legal rules. This information is intended only for the use of the 
individual or entity named above.  If you are not the intended 
recipient, you are hereby notified that any disclosure, copying, 
distribution or the taking of any action in reliance on the contents 
of this emailed information is strictly prohibited.  If you have 
received this email in error, please immediately notify us by 
reply email of the error and then delete this email immediately.