[Zope] How does one display document count of a folder?

[sean@horse101.com]

I am using a script to display the contents of a folder, but I 
wonder how I might display a document count of the dtml 
documents in a folder?

Here is the script I use to display folder contents:

<dtml-with my_folder>
<dtml-in "objectIds()">
<a href="<dtml-var "_.getitem(_['sequence-
item'],0).absolute_url()">"><dtml-var sequence-item></a><br>
</dtml-in>
</dtml-with>

Thanks in advance!