How can I include 2 authentication manager

[mohamed hassan aly]

How can I include 2 authentication manager with spring security 2.0.5 .
<http auto-config="true" >
.....
<intercept-url pattern="/**" access="any" />
</http>
<authentication-provider user-service-ref="userManager">
<password-encoder hash="sha"/>
</authentication-provider>
<authentication-manager alias='authenticationManagerAlias'/>

I want the other one to not use the <password-encoder hash="sha"/> in its provider.