[Zope] Insert a variable problems

[JBeard@porternovelli.com]

In the code below I'm trying to inserta variable for variableHere
The variable name is "order".
I've tried ${order} and all sorts of combos, but nothing seems to work.

 <tr tal:define="sort_on python:(('title_or_id', 'nocase', 'asc'),
 ('bobobase_modification_time', 'cmp', 'variableHere'));>