[Zope] Objects in Zope

I'm a Zope Newbie. How do I determine the type of an object instance, so that I can distinguish between Folders and other types of object? Elliot --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.384 / Virus Database: 216 - Release Date: 21/08/02