[Zope] removing an item from a list

hello (again) i'm still stuck at the same point, that is i want to remove an element from an array, let's say i have dtml-let bozo="a,b,c,d" and i want to kill "c", i thought i could make bozo.remove("b") but it doesn't seem to work, so what can i do about it ? thanx, $ven