[Zope] dtml-in sort_expr and expression

Dear all, I have problem with sorting by values. I have numbers in database in textual form. I need something like <dtml-in database sort=a,b> this sorting is bad becaouse a and b are strings, not numbers. But following examples <dtml-in database sort_expr="int(a),int(b)"> <dtml-in database sort_expr="_str(a).int(),_str(b).int()"> returns errors for all what I was try. Many thanks for help, -- Jaroslav Lukeš -- Tento e-mail nemůže obsahovat VIRY jelikož nepocházi z virózního systému M$ Windows!