Automatic downloading files from microsoft update-catalist

Does anybody know how I can fill in a list with KB-numbers, so that the microsoft update-catalist will go download these?
http://catalog.update.microsoft.com/v7/site/home.aspx
I never scripted before but if anyone can tell me the concept on how to do it, I would be pleased.
Thanks in advance,
Wouter

I never scripted before but if anyone can tell me the concept on how to do it, I would be pleased.
Thanks in advance,
Wouter