Is it possible to use something like the following, except check to see if a certain request parameter was passed in?

Code:
<transition on="$&#123;#result == 'success' and param.prev != null&#125;" to="nameForm"/>
I'd like to be able to use the same bindAndValidate action-state to handle next and previous buttons in a wizard. However, I want to change the transition to be a different form based on whether next or previous was clicked.

Thanks,

Matt