How send Parameters in action

Hi for all:
I have a problem with a action and parameters and would like to know if you can help me.
I have this trigger and when you load up on it he would forward it to a class (SubmissionResponse) which is the reason for referral as the parameter valencia param.idValencia

{{{
xforms:trigger class="voltar_b"
xforms:label Voltar /xforms:label
xforms:load resource="/qualia/SubmissionResponse?valencia={$param.idValencia}" ev:event="DOMActivate"/
/xforms:trigger
}}}

But if I have this code my parameter don't will send? Why?
So how can I put parameters on my action?
Thank for your answers
Jorge Sá