[Zope] dtml-if

What am I doing wrong here? <dtml-var last> -- this prints out the variable sent from last (referring) page fine <dtml-var id> -- this prints out the id of the current item fine <dtml-if "id == last"> this one! </dtml-if> i want this to output "this one!" when the current item is the one requested by the last page but they are never seen as == even when the two dtml-var are the same they are never equal! thanks, mike