passing http user/pass along with SOAP request

[mhudson1976]

I have a WebService (oracle in this case not that it matters) that uses http 
user/pass for authorization and was wondering how do I send SOAP requests that 
include this user/pass in the http header so that I can 1) load the WSDL file 
in the SOAP sampler and 2) submit a request that will be authorized?

Thanks